1. 13 Nov, 2019 11 commits
  2. 08 Nov, 2019 2 commits
  3. 07 Nov, 2019 18 commits
  4. 06 Nov, 2019 4 commits
  5. 05 Nov, 2019 5 commits
    • Jens Axboe's avatar
      Merge branch 'nvme-5.4-rc7' of git://git.infradead.org/nvme into for-linus · 0473976c
      Jens Axboe authored
      Pull NVMe fixes from Keith:
      
      "We have a few late nvme fixes for a couple device removal kernel
       crashes, and a compat fix for a new ioctl introduced during this merge
       window."
      
      * 'nvme-5.4-rc7' of git://git.infradead.org/nvme:
        nvme: change nvme_passthru_cmd64 to explicitly mark rsvd
        nvme-multipath: fix crash in nvme_mpath_clear_ctrl_paths
        nvme-rdma: fix a segmentation fault during module unload
      0473976c
    • Charles Machalow's avatar
      nvme: change nvme_passthru_cmd64 to explicitly mark rsvd · 0d6eeb1f
      Charles Machalow authored
      Changing nvme_passthru_cmd64 to add a field: rsvd2. This field is an explicit
      marker for the padding space added on certain platforms as a result of the
      enlargement of the result field from 32 bit to 64 bits in size, and
      fixes differences in struct size when using compat ioctl for 32-bit
      binaries on 64-bit architecture.
      
      Fixes: 65e68edc ("nvme: allow 64-bit results in passthru commands")
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarCharles Machalow <csm10495@gmail.com>
      [changelog]
      Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
      0d6eeb1f
    • Anton Eidelman's avatar
      nvme-multipath: fix crash in nvme_mpath_clear_ctrl_paths · 763303a8
      Anton Eidelman authored
      nvme_mpath_clear_ctrl_paths() iterates through
      the ctrl->namespaces list while holding ctrl->scan_lock.
      This does not seem to be the correct way of protecting
      from concurrent list modification.
      
      Specifically, nvme_scan_work() sorts ctrl->namespaces
      AFTER unlocking scan_lock.
      
      This may result in the following (rare) crash in ctrl disconnect
      during scan_work:
      
          BUG: kernel NULL pointer dereference, address: 0000000000000050
          Oops: 0000 [#1] SMP PTI
          CPU: 0 PID: 3995 Comm: nvme 5.3.5-050305-generic
          RIP: 0010:nvme_mpath_clear_current_path+0xe/0x90 [nvme_core]
          ...
          Call Trace:
           nvme_mpath_clear_ctrl_paths+0x3c/0x70 [nvme_core]
           nvme_remove_namespaces+0x35/0xe0 [nvme_core]
           nvme_do_delete_ctrl+0x47/0x90 [nvme_core]
           nvme_sysfs_delete+0x49/0x60 [nvme_core]
           dev_attr_store+0x17/0x30
           sysfs_kf_write+0x3e/0x50
           kernfs_fop_write+0x11e/0x1a0
           __vfs_write+0x1b/0x40
           vfs_write+0xb9/0x1a0
           ksys_write+0x67/0xe0
           __x64_sys_write+0x1a/0x20
           do_syscall_64+0x5a/0x130
           entry_SYSCALL_64_after_hwframe+0x44/0xa9
          RIP: 0033:0x7f8d02bfb154
      
      Fix:
      After taking scan_lock in nvme_mpath_clear_ctrl_paths()
      down_read(&ctrl->namespaces_rwsem) as well to make list traversal safe.
      This will not cause deadlocks because taking scan_lock never happens
      while holding the namespaces_rwsem.
      Moreover, scan work downs namespaces_rwsem in the same order.
      
      Alternative: sort ctrl->namespaces in nvme_scan_work()
      while still holding the scan_lock.
      This would leave nvme_mpath_clear_ctrl_paths() without correct protection
      against ctrl->namespaces modification by anyone other than scan_work.
      Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarAnton Eidelman <anton@lightbitslabs.com>
      Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
      763303a8
    • Max Gurtovoy's avatar
      nvme-rdma: fix a segmentation fault during module unload · 9ad9e8d6
      Max Gurtovoy authored
      In case there are controllers that are not associated with any RDMA
      device (e.g. during unsuccessful reconnection) and the user will unload
      the module, these controllers will not be freed and will access already
      freed memory. The same logic appears in other fabric drivers as well.
      
      Fixes: 87fd1253 ("nvme-rdma: remove redundant reference between ib_device and tagset")
      Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
      Signed-off-by: default avatarMax Gurtovoy <maxg@mellanox.com>
      Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
      9ad9e8d6
    • Christoph Hellwig's avatar
      block: avoid blk_bio_segment_split for small I/O operations · fa532287
      Christoph Hellwig authored
      __blk_queue_split() adds significant overhead for small I/O operations.
      Add a shortcut to avoid it for cases where we know we never need to
      split.
      
      Based on a patch from Ming Lei.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      fa532287