This is a revised patch to fix a problem in the UHCI driver, in which the
compiler incorrectly optimizes certain accesses to DMA-able memory
addresses.  The patch reorganizes the code to use special accessor
routines including a compiler optimization barrier, and stores the results
in local variables to help prevent repeated accesses.  No use is made of
the "volatile" keyword.  :-)
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

If a command times out, we resubmit a retry. Some devices, however, buffer
everything we send and then eventually reply to a command we have timed out
already. We receive a bad tag, send a new command, device replies to the
one sent before, and so on without end.

The fix is to flush pending replies if tags mismatch (by reading them).
Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

This "Ours Technology" device incorrectly reports 100% residue on transferred data.
Patch originally sent by Daniel Drake <dsd@gentoo.org>, with slight modification by me.
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Phil Dibowitz <phil@ipom.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

This patch brings up to date the driver with the current stable development
source.  A bug with RTS not raising upon first open was fixed, Al Borcher's
circular write buffer from the pl2303 driver was implemented, and various
fixes/cleanups were made.
Signed-off-by: Lonnie Mendez <lmendez19@austin.rr.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

there's a bug in the acm driver's work arounds. This fixes it.
Signed-Off-By: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

noop doesn't follow the instructions on where to insert a request,
because it uses q->queue_head instead of the *insert assigned. Clean it
up so it's easier to read.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Doing some raid testing threw a bug in the scsi mid layer, because the
segment counts wasn't correct.  Initially I worried that we still had
problems in this area, but it turns out that is due to the raid usage of
bio clones.  Currently you have to hold on to the original bio as well,
since the clone only maintains a pointer to the bio_vec inside the
original bio.  If the original bio is freed first, the clone will have
garbage in its bio->bi_io_vec as soon as that memory is scribbled.

I think the best fix is to maintain flexibility and duplicate the io_vec
inside the clone as well. Attached patch does this.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

into ppc970.osdl.org:/home/torvalds/v2.6/linux

into ppc970.osdl.org:/home/torvalds/v2.6/linux

into suse.cz:/home/perex/bk/linux-sound/linux-sound

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Neil Horman <nhorman@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

- make needlessly global code static
- dn_fib.c: remove the write-only global variable dn_fib_info_cnt
- dn_fib.c: remove the unused global function dn_fib_rt_message
- dn_neigh.c: remove the unused global function dn_neigh_pointopoint_notify
- dn_timer.c: remove the fast timer code that isn't used
Signed-off-by: David S. Miller <davem@davemloft.net>

into nuts.davemloft.net:/disk1/BK/net-2.6

Use the new lock initializers DEFINE_SPIN_LOCk and DEFINE_RW_LOCK
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

into nuts.davemloft.net:/disk1/BK/net-2.6

Signed-off-by: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

into nuts.davemloft.net:/disk1/BK/tgraf-2.6

Signed-off-by: David S. Miller <davem@davemloft.net>

The netlink_post stuff Arjan removed was the only
user of this array.
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: David S. Miller <davem@davemloft.net>

do_tcp_sendpages() needs to do skb->truesize et al.
accounting just like tcp_sendmsg() does.

tcp_sendmsg() works by gradually adjusting these
accounting knobs as user data is copied into the
packet.

do_tcp_sendpages() works differently, when it allocates
a new SKB it optimistically adds in tp->mss_cache to
these values and then makes no adjustments at all as
pages are tacked onto the packet.

This does not work at all if tcp_sendmsg() queues a
packet onto the send queue, and then do_tcp_sendpages()
attaches pages onto the end of that SKB.  We are left
with a very inaccurate skb->truesize in that case.

Consequently, if we were building a TSO frame and it
gets partially ACK'd, then since skb->truesize is too
small tcp_trim_skb() will potentially underflow it's
value and all the accounting becomes corrupted.

This is usually seen as sk->sk_forward_alloc being
negative at socket destroy time, which triggers an
assertion check.
Signed-off-by: David S. Miller <davem@davemloft.net>

into nuts.davemloft.net:/disk1/BK/sparc-2.6

into nuts.davemloft.net:/disk1/BK/net-2.6

This patch fixes a problem I have been seeing since all the preempt
changes went in, which is that ppc64 SMP systems would livelock
randomly if preempt was enabled.

It turns out that what was happening was that one cpu was spinning in
spin_lock_irq (the version at line 215 of kernel/spinlock.c) madly
doing preempt_enable() and preempt_disable() calls.  The other cpu had
the lock and was trying to set the TIF_NEED_RESCHED flag for the task
running on the first cpu.  That is an atomic operation which has to be
retried if another cpu writes to the same cacheline between the load
and the store, which the other cpu was doing every time it did
preempt_enable() or preempt_disable().

I decided to move the thread_info flags field into the next cache
line, since it is the only field that would regularly be modified by
cpus other than the one running the task that owns the thread_info.
(OK possibly the `cpu' field would be on a rebalance; I don't know the
rebalancing code, but that should be pretty infrequent.)  Thus, moving
the flags field seems like a good idea generally as well as solving the
immediate problem.

For the record I am pretty unhappy with the code we use for spin_lock
et al. with preemption turned on (the BUILD_LOCK_OPS stuff in
spinlock.c).  For a start we do the atomic op (_raw_spin_trylock) each
time around the loop.  That is going to be generating a lot of
unnecessary bus (or fabric) traffic.  Instead, after we fail to get
the lock we should poll it with simple loads until we see that it is
clear and then retry the atomic op.  Assuming a reasonable cache
design, the loads won't generate any bus traffic until another cpu
writes to the cacheline containing the lock.

Secondly we have lost the __spin_yield call that we had on ppc64,
which is an important optimization when we are running under the
hypervisor.  I can't just put that in cpu_relax because I need to know
which (virtual) cpu is holding the lock, so that I can tell the
hypervisor which virtual cpu to give my time slice to.  That
information is stored in the lock variable, which is why __spin_yield
needs the address of the lock.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch adds the PREEMPT_BKL config option for PPC64, shamelessly
stolen from the i386 version.  I have this turned on in the kernel on
my desktop G5 and it seems to be just fine.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch enables the DEBUG_PREEMPT config option for PPC64.  I have
this turned on on my desktop G5 and it isn't finding any problems.
(It did find one problem, in flush_tlb_pending(), that I have just
sent a patch for.)

BTW, do we really need to restrict which architectures the config
option is available on?
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This patch mirrors the recent changes on x86 to call preempt_schedule
rather than schedule in the exception exit path, in the case where the
preempt_count is zero and the TIF_NEED_RESCHED bit is set.

I'm a little concerned that this means that we have a window where
interrupts are enabled and we are on our way into preempt_schedule,
but preempt_count is still zero.  Ingo's proposed preempt_schedule_irq
would fix this, and I think something like that should go in.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The preempt debug stuff found a place where we were using
smp_processor_id() without having preemption disabled, in
flush_tlb_pending.  This patch fixes it by using get_cpu_var and
put_cpu_var instead of the __get_cpu_var variant.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

I stumbled across this the other day. The block layer only uses a single
memory pool for request allocation, so it's very possible for eg writes
to have allocated them all at any point in time. If that is the case and
the machine is low on memory, a reader attempting to allocate a request
and failing in blk_alloc_request() can get stuck for a long time since
no one is there to wake it up.

The solution is either to add the extra mempool so both reads and writes
have one, or attempt to handle the situation. I chose the latter, to
save the extra memory required for the additional mempool with
BLKDEV_MIN_RQ statically allocated requests per-queue.

If a read allocation fails and we have no readers in flight for this
queue, mark us rq-starved so that the next write being freed will wake
up the sleeping reader(s). Same situation would happen for writes as
well of course, it's just a lot more unlikely.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

"ATA over Ethernet support" should not default to 'm', it doesn't make
any sense for a special case driver to do so.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Use the new lock initializers DEFINE_SPIN_LOCK and DEFINE_RW_LOCK.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

Documentation,ATIIXP driver
Added ac97_quirk option like intel and via drivers.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

IOCTL32 emulation
Fixed bugs with ctl_read/write ioctls.
The struct size mismatch due to alignment is fixed.
The code is also a bit optimized.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

ATIIXP driver
Try to reread DMA pointer register if the value is invalid.
The register shows bogus values on some broken hardwares.
Signed-off-by: Takashi Iwai <tiwai@suse.de>