1. 30 Jan, 2015 4 commits
  2. 29 Jan, 2015 7 commits
    • Linus Torvalds's avatar
      Merge tag 'dm-3.19-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm · 1c999c47
      Linus Torvalds authored
      Pull device mapper fixes from Mike Snitzer:
       "One stable fix for a dm-cache 3.19-rc6 regression and one stable fix
        for dm-thin:
      
         - fix DM cache metadata open/lookup error paths to properly use
           ERR_PTR and IS_ERR (fixes: 3.19-rc6 "stable" commit 9b1cc9f2)
      
         - fix DM thin-provisioning to disallow userspace from sending
           messages to the thin-pool if the pool is in READ_ONLY or FAIL mode
           since no metadata changes are allowed in these modes"
      
      * tag 'dm-3.19-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
        dm thin: don't allow messages to be sent to a pool target in READ_ONLY or FAIL mode
        dm cache: fix missing ERR_PTR returns and handling
      1c999c47
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-3.19-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs · 353a0c6f
      Linus Torvalds authored
      Pull NFS client bugfixes from Trond Myklebust:
       "Highlights include:
      
         - Stable fix for a NFSv4.1 Oops on mount
         - Stable fix for an O_DIRECT deadlock condition
         - Fix an issue with submounted volumes and fake duplicate inode
           numbers"
      
      * tag 'nfs-for-3.19-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
        NFS: Fix use of nfs_attr_use_mounted_on_fileid()
        NFSv4.1: Fix an Oops in nfs41_walk_client_list
        nfs: fix dio deadlock when O_DIRECT flag is flipped
      353a0c6f
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client · 884e00f3
      Linus Torvalds authored
      Pull Ceph fixes from Sage Weil:
       "These paches from Ilya finally squash a race condition with layered
        images that he's been chasing for a while"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
        rbd: drop parent_ref in rbd_dev_unprobe() unconditionally
        rbd: fix rbd_dev_parent_get() when parent_overlap == 0
      884e00f3
    • Linus Torvalds's avatar
      Merge tag 'sound-3.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · a2ae004a
      Linus Torvalds authored
      Pull sound fixes from Takashi Iwai:
       "This batch ended up being larger than wished, but there is nothing to
        worry too much there.
      
        Most of commits are for ASoC, a compress NULL dereference fix, a fix
        for probe error handling, and the rest are device-specific fixes.  In
        addition, we have a fix for a long-standing but of seq-dummy driver,
        which just cuts off the buggy part in the end"
      
      * tag 'sound-3.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: seq-dummy: remove deadlock-causing events on close
        ASoC: omap-mcbsp: Correct CBM_CFS dai format configuration
        ASoC: soc-compress.c: fix NULL dereference
        ASoC: rt286: set the same format for dac and adc
        ASoC: wm8904: fix runtime warning
        ASoC: simple-card: Fix crash in asoc_simple_card_unref()
        ASoC: fsl: imx-wm8962: Set the card owner field
        ASoC: pcm512x: Fix DSP program selection
        ASoC: rt5677: Modify the behavior that updates the PLL parameter.
        ASoC: fsl_ssi: Fix irq error check
        ASoC: rockchip: i2s: applys rate symmetry for CPU DAI
        ASoC: Intel: Add NULL checks for the stream pointer
        ASoC: wm8960: Fix capture sample rate from 11250 to 11025
        ASoC: adi: Add missing return statement.
        ASoC: Intel: Don't change offset of block allocator during fixed allocate
        ASoC: ts3a227e: Check and report jack status at probe
        ASoC: fsl_esai: Fix incorrect xDC field width of xCCR registers
      a2ae004a
    • Linus Torvalds's avatar
      Merge tag 'pinctrl-v3.19-4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl · 297614f3
      Linus Torvalds authored
      Pull final pin control fix from Linus Walleij:
       "A late pin control fix for the v3.19 series: The AT91 gpio controller
        would miss wakeup events, this single fix make it work properly"
      
      [ "Final"? Yeah, I'll believe that once I've actually released 3.19 ;)   - Linus ]
      
      * tag 'pinctrl-v3.19-4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
        pinctrl: at91: allow to have disabled gpio bank
      297614f3
    • Linus Torvalds's avatar
      vm: make stack guard page errors return VM_FAULT_SIGSEGV rather than SIGBUS · 9c145c56
      Linus Torvalds authored
      The stack guard page error case has long incorrectly caused a SIGBUS
      rather than a SIGSEGV, but nobody actually noticed until commit
      fee7e49d ("mm: propagate error from stack expansion even for guard
      page") because that error case was never actually triggered in any
      normal situations.
      
      Now that we actually report the error, people noticed the wrong signal
      that resulted.  So far, only the test suite of libsigsegv seems to have
      actually cared, but there are real applications that use libsigsegv, so
      let's not wait for any of those to break.
      Reported-and-tested-by: default avatarTakashi Iwai <tiwai@suse.de>
      Tested-by: default avatarJan Engelhardt <jengelh@inai.de>
      Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots"
      Cc: linux-arch@vger.kernel.org
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9c145c56
    • Linus Torvalds's avatar
      vm: add VM_FAULT_SIGSEGV handling support · 33692f27
      Linus Torvalds authored
      The core VM already knows about VM_FAULT_SIGBUS, but cannot return a
      "you should SIGSEGV" error, because the SIGSEGV case was generally
      handled by the caller - usually the architecture fault handler.
      
      That results in lots of duplication - all the architecture fault
      handlers end up doing very similar "look up vma, check permissions, do
      retries etc" - but it generally works.  However, there are cases where
      the VM actually wants to SIGSEGV, and applications _expect_ SIGSEGV.
      
      In particular, when accessing the stack guard page, libsigsegv expects a
      SIGSEGV.  And it usually got one, because the stack growth is handled by
      that duplicated architecture fault handler.
      
      However, when the generic VM layer started propagating the error return
      from the stack expansion in commit fee7e49d ("mm: propagate error
      from stack expansion even for guard page"), that now exposed the
      existing VM_FAULT_SIGBUS result to user space.  And user space really
      expected SIGSEGV, not SIGBUS.
      
      To fix that case, we need to add a VM_FAULT_SIGSEGV, and teach all those
      duplicate architecture fault handlers about it.  They all already have
      the code to handle SIGSEGV, so it's about just tying that new return
      value to the existing code, but it's all a bit annoying.
      
      This is the mindless minimal patch to do this.  A more extensive patch
      would be to try to gather up the mostly shared fault handling logic into
      one generic helper routine, and long-term we really should do that
      cleanup.
      
      Just from this patch, you can generally see that most architectures just
      copied (directly or indirectly) the old x86 way of doing things, but in
      the meantime that original x86 model has been improved to hold the VM
      semaphore for shorter times etc and to handle VM_FAULT_RETRY and other
      "newer" things, so it would be a good idea to bring all those
      improvements to the generic case and teach other architectures about
      them too.
      Reported-and-tested-by: default avatarTakashi Iwai <tiwai@suse.de>
      Tested-by: default avatarJan Engelhardt <jengelh@inai.de>
      Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots"
      Cc: linux-arch@vger.kernel.org
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      33692f27
  3. 28 Jan, 2015 5 commits
    • Joe Thornber's avatar
      dm thin: don't allow messages to be sent to a pool target in READ_ONLY or FAIL mode · 2a7eaea0
      Joe Thornber authored
      You can't modify the metadata in these modes.  It's better to fail these
      messages immediately than let the block-manager deny write locks on
      metadata blocks.  Otherwise these failed metadata changes will trigger
      'needs_check' to get set in the metadata superblock -- requiring repair
      using the thin_check utility.
      Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Cc: stable@vger.kernel.org
      2a7eaea0
    • Joe Thornber's avatar
      dm cache: fix missing ERR_PTR returns and handling · 766a7888
      Joe Thornber authored
      Commit 9b1cc9f2 ("dm cache: share cache-metadata object across
      inactive and active DM tables") mistakenly ignored the use of ERR_PTR
      returns.  Restore missing IS_ERR checks and ERR_PTR returns where
      appropriate.
      Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Cc: stable@vger.kernel.org
      766a7888
    • Ilya Dryomov's avatar
      rbd: drop parent_ref in rbd_dev_unprobe() unconditionally · e69b8d41
      Ilya Dryomov authored
      This effectively reverts the last hunk of 392a9dad ("rbd: detect
      when clone image is flattened").
      
      The problem with parent_overlap != 0 condition is that it's possible
      and completely valid to have an image with parent_overlap == 0 whose
      parent state needs to be cleaned up on unmap.  The next commit, which
      drops the "clone image now standalone" logic, opens up another window
      of opportunity to hit this, but even without it
      
          # cat parent-ref.sh
          #!/bin/bash
          rbd create --image-format 2 --size 1 foo
          rbd snap create foo@snap
          rbd snap protect foo@snap
          rbd clone foo@snap bar
          rbd resize --allow-shrink --size 0 bar
          rbd resize --size 1 bar
          DEV=$(rbd map bar)
          rbd unmap $DEV
      
      leaves rbd_device/rbd_spec/etc and rbd_client along with ceph_client
      hanging around.
      
      My thinking behind calling rbd_dev_parent_put() unconditionally is that
      there shouldn't be any requests in flight at that point in time as we
      are deep into unmap sequence.  Hence, even if rbd_dev_unparent() caused
      by flatten is delayed by in-flight requests, it will have finished by
      the time we reach rbd_dev_unprobe() caused by unmap, thus turning
      unconditional rbd_dev_parent_put() into a no-op.
      
      Fixes: http://tracker.ceph.com/issues/10352
      
      Cc: stable@vger.kernel.org # 3.11+
      Signed-off-by: default avatarIlya Dryomov <idryomov@redhat.com>
      Reviewed-by: default avatarJosh Durgin <jdurgin@redhat.com>
      Reviewed-by: default avatarAlex Elder <elder@linaro.org>
      e69b8d41
    • Ilya Dryomov's avatar
      rbd: fix rbd_dev_parent_get() when parent_overlap == 0 · ae43e9d0
      Ilya Dryomov authored
      The comment for rbd_dev_parent_get() said
      
          * We must get the reference before checking for the overlap to
          * coordinate properly with zeroing the parent overlap in
          * rbd_dev_v2_parent_info() when an image gets flattened.  We
          * drop it again if there is no overlap.
      
      but the "drop it again if there is no overlap" part was missing from
      the implementation.  This lead to absurd parent_ref values for images
      with parent_overlap == 0, as parent_ref was incremented for each
      img_request and virtually never decremented.
      
      Fix this by leveraging the fact that refresh path calls
      rbd_dev_v2_parent_info() under header_rwsem and use it for read in
      rbd_dev_parent_get(), instead of messing around with atomics.  Get rid
      of barriers in rbd_dev_v2_parent_info() while at it - I don't see what
      they'd pair with now and I suspect we are in a pretty miserable
      situation as far as proper locking goes regardless.
      
      Cc: stable@vger.kernel.org # 3.11+
      Signed-off-by: default avatarIlya Dryomov <idryomov@redhat.com>
      Reviewed-by: default avatarJosh Durgin <jdurgin@redhat.com>
      Reviewed-by: default avatarAlex Elder <elder@linaro.org>
      ae43e9d0
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · c59c961c
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "This feels larger than I'd like but its for three reasons.
      
         a) amdkfd finalising the API more, this is a new feature introduced
            last merge window, and I'd prefer to make the tweaks to the API
            before it first gets into a stable release.
      
         b) radeon regression required splitting an internal API to fix
            properly, so it just changed a few more lines
      
         c) vmwgfx fix changes a lock from a mutex->spin lock, this is fallout
            from the new sleep checking.
      
        Otherwise there is just some tda998x fixes"
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
        drm/radeon: Remove rdev->gart.pages_addr array
        drm/radeon: Restore GART table contents after pinning it in VRAM v3
        drm/radeon: Split off gart_get_page_entry ASIC hook from set_page_entry
        drm/amdkfd: Fix bug in call to init_pipelines()
        drm/amdkfd: Fix bug in pipelines initialization
        drm/radeon: Don't increment pipe_id in kgd_init_pipeline
        drm/i2c: tda998x: set the CEC I2C address based on the slave I2C address
        drm/vmwgfx: Replace the hw mutex with a hw spinlock
        drm/amdkfd: Allow user to limit only queues per device
        drm/amdkfd: PQM handle queue creation fault
        drm: tda998x: Fix EDID read timeout on HDMI connect
        drm: tda998x: Protect the page register
      c59c961c
  4. 27 Jan, 2015 24 commits
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 59343cd7
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Don't OOPS on socket AIO, from Christoph Hellwig.
      
       2) Scheduled scans should be aborted upon RFKILL, from Emmanuel
          Grumbach.
      
       3) Fix sleep in atomic context in kvaser_usb, from Ahmed S Darwish.
      
       4) Fix RCU locking across copy_to_user() in bpf code, from Alexei
          Starovoitov.
      
       5) Lots of crash, memory leak, short TX packet et al bug fixes in
          sh_eth from Ben Hutchings.
      
       6) Fix memory corruption in SCTP wrt.  INIT collitions, from Daniel
          Borkmann.
      
       7) Fix return value logic for poll handlers in netxen, enic, and bnx2x.
          From Eric Dumazet and Govindarajulu Varadarajan.
      
       8) Header length calculation fix in mac80211 from Fred Chou.
      
       9) mv643xx_eth doesn't handle highmem correctly in non-TSO code paths.
          From Ezequiel Garcia.
      
      10) udp_diag has bogus logic in it's hash chain skipping, copy same fix
          tcp diag used.  From Herbert Xu.
      
      11) amd-xgbe programs wrong rx flow control register, from Thomas
          Lendacky.
      
      12) Fix race leading to use after free in ping receive path, from Subash
          Abhinov Kasiviswanathan.
      
      13) Cache redirect routes otherwise we can get a heavy backlog of rcu
          jobs liberating DST_NOCACHE entries.  From Hannes Frederic Sowa.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (48 commits)
        net: don't OOPS on socket aio
        stmmac: prevent probe drivers to crash kernel
        bnx2x: fix napi poll return value for repoll
        ipv6: replacing a rt6_info needs to purge possible propagated rt6_infos too
        sh_eth: Fix DMA-API usage for RX buffers
        sh_eth: Check for DMA mapping errors on transmit
        sh_eth: Ensure DMA engines are stopped before freeing buffers
        sh_eth: Remove RX overflow log messages
        ping: Fix race in free in receive path
        udp_diag: Fix socket skipping within chain
        can: kvaser_usb: Fix state handling upon BUS_ERROR events
        can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUT
        can: kvaser_usb: Send correct context to URB completion
        can: kvaser_usb: Do not sleep in atomic context
        ipv4: try to cache dst_entries which would cause a redirect
        samples: bpf: relax test_maps check
        bpf: rcu lock must not be held when calling copy_to_user()
        net: sctp: fix slab corruption from use after free on INIT collisions
        net: mv643xx_eth: Fix highmem support in non-TSO egress path
        sh_eth: Fix serialisation of interrupt disable with interrupt & NAPI handlers
        ...
      59343cd7
    • Christoph Hellwig's avatar
      net: don't OOPS on socket aio · 06539d30
      Christoph Hellwig authored
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      06539d30
    • Andy Shevchenko's avatar
      stmmac: prevent probe drivers to crash kernel · 9afec6ef
      Andy Shevchenko authored
      In the case when alloc_netdev fails we return NULL to a caller. But there is no
      check for NULL in the probe drivers. This patch changes NULL to an error
      pointer. The function description is amended to reflect what we may get
      returned.
      Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9afec6ef
    • Linus Torvalds's avatar
      Merge tag 'powerpc-3.19-5' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux · 7da323bb
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Two powerpc fixes"
      
      * tag 'powerpc-3.19-5' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
        powerpc/powernv: Restore LPCR with LPCR_PECE1 cleared
        powerpc/xmon: Fix another endiannes issue in RTAS call from xmon
      7da323bb
    • Linus Torvalds's avatar
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux · 41592e2f
      Linus Torvalds authored
      Pull one more module fix from Rusty Russell:
       "SCSI was using module_refcount() to figure out when the module was
        unloading: this broke with new atomic refcounting.  The code is still
        suspicious, but this solves the WARN_ON()"
      
      * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
        scsi: always increment reference count
      41592e2f
    • Govindarajulu Varadarajan's avatar
      bnx2x: fix napi poll return value for repoll · 24e579c8
      Govindarajulu Varadarajan authored
      With the commit d75b1ade ("net: less interrupt masking in NAPI") napi
      repoll is done only when work_done == budget. When in busy_poll is we return 0
      in napi_poll. We should return budget.
      Signed-off-by: default avatarGovindarajulu Varadarajan <_govind@gmx.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      24e579c8
    • David S. Miller's avatar
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec · bf693f7b
      David S. Miller authored
      Steffen Klassert says:
      
      ====================
      ipsec 2015-01-26
      
      Just two small fixes for _decode_session6() where we
      might decode to wrong header information in some rare
      situations.
      
      Please pull or let me know if there are problems.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bf693f7b
    • Hannes Frederic Sowa's avatar
      ipv6: replacing a rt6_info needs to purge possible propagated rt6_infos too · 6e9e16e6
      Hannes Frederic Sowa authored
      Lubomir Rintel reported that during replacing a route the interface
      reference counter isn't correctly decremented.
      
      To quote bug <https://bugzilla.kernel.org/show_bug.cgi?id=91941>:
      | [root@rhel7-5 lkundrak]# sh -x lal
      | + ip link add dev0 type dummy
      | + ip link set dev0 up
      | + ip link add dev1 type dummy
      | + ip link set dev1 up
      | + ip addr add 2001:db8:8086::2/64 dev dev0
      | + ip route add 2001:db8:8086::/48 dev dev0 proto static metric 20
      | + ip route add 2001:db8:8088::/48 dev dev1 proto static metric 10
      | + ip route replace 2001:db8:8086::/48 dev dev1 proto static metric 20
      | + ip link del dev0 type dummy
      | Message from syslogd@rhel7-5 at Jan 23 10:54:41 ...
      |  kernel:unregister_netdevice: waiting for dev0 to become free. Usage count = 2
      |
      | Message from syslogd@rhel7-5 at Jan 23 10:54:51 ...
      |  kernel:unregister_netdevice: waiting for dev0 to become free. Usage count = 2
      
      During replacement of a rt6_info we must walk all parent nodes and check
      if the to be replaced rt6_info got propagated. If so, replace it with
      an alive one.
      
      Fixes: 4a287eba ("IPv6 routing, NLM_F_* flag support: REPLACE and EXCL flags support, warn about missing CREATE flag")
      Reported-by: default avatarLubomir Rintel <lkundrak@v3.sk>
      Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
      Tested-by: default avatarLubomir Rintel <lkundrak@v3.sk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6e9e16e6
    • David S. Miller's avatar
      Merge branch 'sh_eth' · 22577609
      David S. Miller authored
      Ben Hutchings says:
      
      ====================
      Fixes for sh_eth #3
      
      I'm continuing review and testing of Ethernet support on the R-Car H2
      chip.  This series fixes the last of the more serious issues I've found.
      
      These are not tested on any of the other supported chips.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      22577609
    • Ben Hutchings's avatar
      sh_eth: Fix DMA-API usage for RX buffers · 52b9fa36
      Ben Hutchings authored
      - Use the return value of dma_map_single(), rather than calling
        virt_to_page() separately
      - Check for mapping failue
      - Call dma_unmap_single() rather than dma_sync_single_for_cpu()
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      52b9fa36
    • Ben Hutchings's avatar
      sh_eth: Check for DMA mapping errors on transmit · aa3933b8
      Ben Hutchings authored
      dma_map_single() may fail if an IOMMU or swiotlb is in use, so
      we need to check for this.
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      aa3933b8
    • Ben Hutchings's avatar
      sh_eth: Ensure DMA engines are stopped before freeing buffers · 740c7f31
      Ben Hutchings authored
      Currently we try to clear EDRRR and EDTRR and immediately continue to
      free buffers.  This is unsafe because:
      
      - In general, register writes are not serialised with DMA, so we still
        have to wait for DMA to complete somehow
      - The R8A7790 (R-Car H2) manual states that the TX running flag cannot
        be cleared by writing to EDTRR
      - The same manual states that clearing the RX running flag only stops
        RX DMA at the next packet boundary
      
      I applied this patch to the driver to detect DMA writes to freed
      buffers:
      
      > --- a/drivers/net/ethernet/renesas/sh_eth.c
      > +++ b/drivers/net/ethernet/renesas/sh_eth.c
      > @@ -1098,7 +1098,14 @@ static void sh_eth_ring_free(struct net_device *ndev)
      >  	/* Free Rx skb ringbuffer */
      >  	if (mdp->rx_skbuff) {
      >  		for (i = 0; i < mdp->num_rx_ring; i++)
      > +			memcpy(mdp->rx_skbuff[i]->data,
      > +			       "Hello, world", 12);
      > +		msleep(100);
      > +		for (i = 0; i < mdp->num_rx_ring; i++) {
      > +			WARN_ON(memcmp(mdp->rx_skbuff[i]->data,
      > +				       "Hello, world", 12));
      >  			dev_kfree_skb(mdp->rx_skbuff[i]);
      > +		}
      >  	}
      >  	kfree(mdp->rx_skbuff);
      >  	mdp->rx_skbuff = NULL;
      
      then ran the loop:
      
          while ethtool -G eth0 rx 128 ; ethtool -G eth0 rx 64; do echo -n .; done
      
      and 'ping -f' toward the sh_eth port from another machine.  The
      warning fired several times a minute.
      
      To fix these issues:
      
      - Deactivate all TX descriptors rather than writing to EDTRR
      - As there seems to be no way of telling when RX DMA is stopped,
        perform a soft reset to ensure that both DMA enginess are stopped
      - To reduce the possibility of the reset truncating a transmitted
        frame, disable egress and wait a reasonable time to reach a
        packet boundary before resetting
      - Update statistics before resetting
      
      (The 'reasonable time' does not allow for CS/CD in half-duplex
      mode, but half-duplex no longer seems reasonable!)
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      740c7f31
    • Ben Hutchings's avatar
      sh_eth: Remove RX overflow log messages · dc1d0e6d
      Ben Hutchings authored
      If RX traffic is overflowing the FIFO or DMA ring, logging every time
      this happens just makes things worse.  These errors are visible in the
      statistics anyway.
      Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      dc1d0e6d
    • David S. Miller's avatar
      Merge tag 'linux-can-fixes-for-3.19-20150127' of... · 8d8d67f1
      David S. Miller authored
      Merge tag 'linux-can-fixes-for-3.19-20150127' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can
      
      Marc Kleine-Budde says:
      
      ====================
      pull-request: can 2015-01-27
      
      this is another pull request for net/master which consists of 4 patches.
      
      All 4 patches are contributed by Ahmed S. Darwish, he fixes more problems in
      the kvaser_usb driver.
      
      David, please merge net/master to net-next/master, as we have more kvaser_usb
      patches in the queue, that target net-next.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8d8d67f1
    • subashab@codeaurora.org's avatar
      ping: Fix race in free in receive path · fc752f1f
      subashab@codeaurora.org authored
      An exception is seen in ICMP ping receive path where the skb
      destructor sock_rfree() tries to access a freed socket. This happens
      because ping_rcv() releases socket reference with sock_put() and this
      internally frees up the socket. Later icmp_rcv() will try to free the
      skb and as part of this, skb destructor is called and which leads
      to a kernel panic as the socket is freed already in ping_rcv().
      
      -->|exception
      -007|sk_mem_uncharge
      -007|sock_rfree
      -008|skb_release_head_state
      -009|skb_release_all
      -009|__kfree_skb
      -010|kfree_skb
      -011|icmp_rcv
      -012|ip_local_deliver_finish
      
      Fix this incorrect free by cloning this skb and processing this cloned
      skb instead.
      
      This patch was suggested by Eric Dumazet
      Signed-off-by: default avatarSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
      Cc: Eric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fc752f1f
    • Herbert Xu's avatar
      udp_diag: Fix socket skipping within chain · 86f3cddb
      Herbert Xu authored
      While working on rhashtable walking I noticed that the UDP diag
      dumping code is buggy.  In particular, the socket skipping within
      a chain never happens, even though we record the number of sockets
      that should be skipped.
      
      As this code was supposedly copied from TCP, this patch does what
      TCP does and resets num before we walk a chain.
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      Acked-by: default avatarPavel Emelyanov <xemul@parallels.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      86f3cddb
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Fix state handling upon BUS_ERROR events · e638642b
      Ahmed S. Darwish authored
      While being in an ERROR_WARNING state, and receiving further
      bus error events with error counters still in the ERROR_WARNING
      range of 97-127 inclusive, the state handling code erroneously
      reverts back to ERROR_ACTIVE.
      
      Per the CAN standard, only revert to ERROR_ACTIVE when the
      error counters are less than 96.
      
      Moreover, in certain Kvaser models, the BUS_ERROR flag is
      always set along with undefined bits in the M16C status
      register. Thus use bitwise operators instead of full equality
      for checking that register against bus errors.
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      e638642b
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Retry the first bulk transfer on -ETIMEDOUT · 14c10c2a
      Ahmed S. Darwish authored
      On some x86 laptops, plugging a Kvaser device again after an
      unplug makes the firmware always ignore the very first command.
      For such a case, provide some room for retries instead of
      completely exiting the driver init code.
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      14c10c2a
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Send correct context to URB completion · 3803fa69
      Ahmed S. Darwish authored
      Send expected argument to the URB completion hander: a CAN
      netdevice instead of the network interface private context
      `kvaser_usb_net_priv'.
      
      This was discovered by having some garbage in the kernel
      log in place of the netdevice names: can0 and can1.
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      3803fa69
    • Ahmed S. Darwish's avatar
      can: kvaser_usb: Do not sleep in atomic context · ded50066
      Ahmed S. Darwish authored
      Upon receiving a hardware event with the BUS_RESET flag set,
      the driver kills all of its anchored URBs and resets all of
      its transmit URB contexts.
      
      Unfortunately it does so under the context of URB completion
      handler `kvaser_usb_read_bulk_callback()', which is often
      called in an atomic context.
      
      While the device is flooded with many received error packets,
      usb_kill_urb() typically sleeps/reschedules till the transfer
      request of each killed URB in question completes, leading to
      the sleep in atomic bug. [3]
      
      In v2 submission of the original driver patch [1], it was
      stated that the URBs kill and tx contexts reset was needed
      since we don't receive any tx acknowledgments later and thus
      such resources will be locked down forever. Fortunately this
      is no longer needed since an earlier bugfix in this patch
      series is now applied: all tx URB contexts are reset upon CAN
      channel close. [2]
      
      Moreover, a BUS_RESET is now treated _exactly_ like a BUS_OFF
      event, which is the recommended handling method advised by
      the device manufacturer.
      
      [1] http://article.gmane.org/gmane.linux.network/239442
          http://www.webcitation.org/6Vr2yagAQ
      
      [2] can: kvaser_usb: Reset all URB tx contexts upon channel close
          889b77f7
      
      [3] Stacktrace:
      
       <IRQ>  [<ffffffff8158de87>] dump_stack+0x45/0x57
       [<ffffffff8158b60c>] __schedule_bug+0x41/0x4f
       [<ffffffff815904b1>] __schedule+0x5f1/0x700
       [<ffffffff8159360a>] ? _raw_spin_unlock_irqrestore+0xa/0x10
       [<ffffffff81590684>] schedule+0x24/0x70
       [<ffffffff8147d0a5>] usb_kill_urb+0x65/0xa0
       [<ffffffff81077970>] ? prepare_to_wait_event+0x110/0x110
       [<ffffffff8147d7d8>] usb_kill_anchored_urbs+0x48/0x80
       [<ffffffffa01f4028>] kvaser_usb_unlink_tx_urbs+0x18/0x50 [kvaser_usb]
       [<ffffffffa01f45d0>] kvaser_usb_rx_error+0xc0/0x400 [kvaser_usb]
       [<ffffffff8108b14a>] ? vprintk_default+0x1a/0x20
       [<ffffffffa01f5241>] kvaser_usb_read_bulk_callback+0x4c1/0x5f0 [kvaser_usb]
       [<ffffffff8147a73e>] __usb_hcd_giveback_urb+0x5e/0xc0
       [<ffffffff8147a8a1>] usb_hcd_giveback_urb+0x41/0x110
       [<ffffffffa0008748>] finish_urb+0x98/0x180 [ohci_hcd]
       [<ffffffff810cd1a7>] ? acct_account_cputime+0x17/0x20
       [<ffffffff81069f65>] ? local_clock+0x15/0x30
       [<ffffffffa000a36b>] ohci_work+0x1fb/0x5a0 [ohci_hcd]
       [<ffffffff814fbb31>] ? process_backlog+0xb1/0x130
       [<ffffffffa000cd5b>] ohci_irq+0xeb/0x270 [ohci_hcd]
       [<ffffffff81479fc1>] usb_hcd_irq+0x21/0x30
       [<ffffffff8108bfd3>] handle_irq_event_percpu+0x43/0x120
       [<ffffffff8108c0ed>] handle_irq_event+0x3d/0x60
       [<ffffffff8108ec84>] handle_fasteoi_irq+0x74/0x110
       [<ffffffff81004dfd>] handle_irq+0x1d/0x30
       [<ffffffff81004727>] do_IRQ+0x57/0x100
       [<ffffffff8159482a>] common_interrupt+0x6a/0x6a
      Signed-off-by: default avatarAhmed S. Darwish <ahmed.darwish@valeo.com>
      Cc: linux-stable <stable@vger.kernel.org>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      ded50066
    • David S. Miller's avatar
      Merge tag 'mac80211-for-davem-2015-01-23' of... · 7d63585b
      David S. Miller authored
      Merge tag 'mac80211-for-davem-2015-01-23' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211
      
      Another set of last-minute fixes:
       * fix station double-removal when suspending while associating
       * fix the HT (802.11n) header length calculation
       * fix the CCK radiotap flag used for monitoring, a pretty
         old regression but a simple one-liner
       * fix per-station group-key handling
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7d63585b
    • Hannes Frederic Sowa's avatar
      ipv4: try to cache dst_entries which would cause a redirect · df4d9254
      Hannes Frederic Sowa authored
      Not caching dst_entries which cause redirects could be exploited by hosts
      on the same subnet, causing a severe DoS attack. This effect aggravated
      since commit f8864972 ("ipv4: fix dst race in sk_dst_get()").
      
      Lookups causing redirects will be allocated with DST_NOCACHE set which
      will force dst_release to free them via RCU.  Unfortunately waiting for
      RCU grace period just takes too long, we can end up with >1M dst_entries
      waiting to be released and the system will run OOM. rcuos threads cannot
      catch up under high softirq load.
      
      Attaching the flag to emit a redirect later on to the specific skb allows
      us to cache those dst_entries thus reducing the pressure on allocation
      and deallocation.
      
      This issue was discovered by Marcelo Leitner.
      
      Cc: Julian Anastasov <ja@ssi.bg>
      Signed-off-by: default avatarMarcelo Leitner <mleitner@redhat.com>
      Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
      Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
      Signed-off-by: default avatarJulian Anastasov <ja@ssi.bg>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      df4d9254
    • David S. Miller's avatar
      Merge branch 'bpf' · 412d2907
      David S. Miller authored
      Alexei Starovoitov says:
      
      ====================
      bpf: fix two bugs
      
      Michael Holzheu caught two issues (in bpf syscall and in the test).
      Fix them. Details in corresponding patches.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      412d2907
    • Alexei Starovoitov's avatar
      samples: bpf: relax test_maps check · ba1a68bf
      Alexei Starovoitov authored
      hash map is unordered, so get_next_key() iterator shouldn't
      rely on particular order of elements. So relax this test.
      
      Fixes: ffb65f27 ("bpf: add a testsuite for eBPF maps")
      Reported-by: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
      Signed-off-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
      Acked-by: default avatarDaniel Borkmann <dborkman@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ba1a68bf