[PATCH V5 0/4] scsi: ufs: Improve UFS error handling

[Sujit Reddy Thumma <sthumma@codeaurora.org>]

The first patch fixes many issues with current task management handling
in UFSHCD driver. Others improve error handling in various scenarios.

These patches are rebased on:
[PATCH 9/9] drivers/scsi/ufs: don't check resource with devm_ioremap_resource

Changes from v4:
	- Addressed comments from Seungwon Jeon on V3
	- Updated with proper locking while ufshcd state changes
	- Retained LUN reset instead of device reset with DME_END_POINT_RESET
	- Removed error handling decisions dependent on OCS value
	- Simplified fatal error handling to abort the requests first
	  and then carry out reset.
Changes from v3:
	- Rebased.
Changes from v2:
	- [PATCH V3 1/4]: Make the task management command task tag unique
	  across SCSI/NOP/QUERY request tags.
	- [PATCH V3 3/4]: While handling device/host reset, wait for
	  pending fatal handler to return if running.
Changes from v1:
	- [PATCH V2 1/4]: Fix a race condition because of overloading
	  outstanding_tasks variable to lock the slots. A new variable
	  tm_slots_in_use will track which slots are in use by the driver.
	- [PATCH V2 2/4]: Commit text update to clarify the hardware race
	  with more details.
	- [PATCH V2 3/4]: Minor cleanup and rebase
	- [PATCH V2 4/4]: Fix a bug - sleeping in atomic context

Sujit Reddy Thumma (4):
  scsi: ufs: Fix broken task management command implementation
  scsi: ufs: Fix hardware race conditions while aborting a command
  scsi: ufs: Fix device and host reset methods
  scsi: ufs: Improve UFS fatal error handling

 drivers/scsi/ufs/ufshcd.c |  684 ++++++++++++++++++++++++++++++++-------------
 drivers/scsi/ufs/ufshcd.h |   20 +-
 2 files changed, 501 insertions(+), 203 deletions(-)

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