On Fri, 23 Apr 2021 17:20:15 -0700, Asutosh Das wrote:

This patch attempts to fix a deadlock in ufs while sending SSU.
Recently, blk_queue_enter() added a check to not process requests if the
queue is suspended. That leads to a resume of the associated device which
is suspended. In ufs, that device is ufs device wlun and it's parent is
ufs_hba. This resume tries to resume ufs device wlun which in turn tries
to resume ufs_hba, which is already in the process of suspending, thus
causing a deadlock.

[...]

Applied to 5.14/scsi-queue, thanks!

[1/2] scsi: ufs: Enable power management for wlun
      https://git.kernel.org/mkp/scsi/c/b294ff3e3449
[2/2] ufs: sysfs: Resume the proper scsi device
      https://git.kernel.org/mkp/scsi/c/aef80fd1da32

-- 
Martin K. Petersen	Oracle Linux Engineering

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