[PATCH v5 0/4] Simplify and optimize the UFS driver

[Bart Van Assche <bvanassche@acm.org>]

Hello Martin,

This patch series that simplifies and optimizes the UFS driver. Please consider
this patch series for kernel v5.5.

Thanks,

Bart.

Changes compared to v4:
- Reverted back to scsi_block_requests() / scsi_unblock_requests() for the
  UFS error handler.
- Added a new patch that serializes error handling and command submission.
- Fixed a blk_mq_init_queue() return value check.

Changes compared to v3:
- Left out "scsi" from the name of the functions that suspend and resume
  command processing.

Changes compared to v2:
- Use a separate tag set for TMF tags.

Changes compared to v1:
- Use the block layer tag infrastructure for managing TMF tags.

Bart Van Assche (4):
  ufs: Serialize error handling and command submission
  ufs: Avoid busy-waiting by eliminating tag conflicts
  ufs: Use blk_{get,put}_request() to allocate and free TMFs
  ufs: Simplify the clock scaling mechanism implementation

 drivers/scsi/ufs/ufshcd.c | 396 +++++++++++++++++---------------------
 drivers/scsi/ufs/ufshcd.h |  21 +-
 2 files changed, 186 insertions(+), 231 deletions(-)