[PATCH 0/4 v8] Fixes for SCSI device removal

[Bart Van Assche <bvanassche@xxxxxxx>]

This is version eight of the SCSI device removal patch series. This
version of this patch series has been tested by triggering a large
number of removals of a SCSI device controlled by the ib_srp LLD and at
the same time running an I/O integrity test with fio on a dm device on
top of the SRP SCSI device.

Changes compared to v7:
- Made sure that __scsi_queue_insert() processes the request that has
  been passed to that function. Added a comment in that function too.
- Fixed a typo in the description of the first patch in this series
  and removed "CC: stable".

Changes compared to v6:
- Added a fix for a race in the block layer.
- Moved a BUG_ON(!sdev) statement up since it's a precondition check.
- Changed return type of scsi_queue_insert() from int to void.
- Added a cancel_work_sync(&sdev->requeue_work) call in
  __scsi_remove_device().

Changes compared to v5:
- Removed the function scsi_free_queue() and inlined that function
  in its callers.
- Added two additional patches.
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