[PATCH 0/7 v5] More device removal fixes

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Fix a few race conditions that can be triggered by removing a device:
- Avoid that request_fn() can be invoked on a dead queue.
- Avoid that blk_cleanup_queue() can finish while request_fn is still
  running.
- Fix a race between starved list processing and device removal.

These patches have been tested on top of kernel v3.7-rc2.

Changes compared to v4:
- Moved queue_flag_set(QUEUE_FLAG_DEAD, q) from blk_drain_queue() into
  blk_cleanup_queue().
- Declared the new __blk_run_queue_uncond() function inline. Checked in
  the generated assembler code that this function is really inlined in
  __blk_run_queue().
- Elaborated several patch descriptions.
- Added sparse annotations to scsi_request_fn().
- Split several patches.

Changes compared to v3:
- Fixed a race condition by setting QUEUE_FLAG_DEAD earlier.
- Added a patch for fixing a race between starved list processing
  and device removal to this series.

Changes compared to v2:
- Split second patch into two patches.
- Refined patch descriptions.

Changes compared to v1:
- Included a patch to rename QUEUE_FLAG_DEAD.
- Refined the descriptions of the __blk_run_queue_uncond() and
  blk_cleanup_queue() functions.

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