On 8/15/22 11:02, Greg Kroah-Hartman wrote:
From: Bart Van Assche bvanassche@acm.org
[ Upstream commit 88f1669019bd62b3009a3cebf772fbaaa21b9f38 ]
For some technologies, e.g. an ATA bus, resuming can take multiple seconds. Waiting for resume to finish can cause a very noticeable delay. Hence this commit that restores the behavior from before "scsi: core: pm: Rely on the device driver core for async power management" for most SCSI devices.
This commit introduces a behavior change: if the START command fails, do not consider this as a SCSI disk resume failure.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215880 Link: https://lore.kernel.org/r/20220630195703.10155-3-bvanassche@acm.org Fixes: a19a93e4c6a9 ("scsi: core: pm: Rely on the device driver core for async power management")
Hi Greg,
It has been reported that this patch causes a regression, namely disks not coming back after a resume. That issue is worse than the issue fixed by this patch - eliminating a delay. Please drop this patch from the stable tree.
A revert of this patch has been posted on the linux-scsi mailing list. See also https://lore.kernel.org/linux-scsi/8a83665a-1951-a326-f930-8fcbb0c4dd9a@huaw....
Thanks,
Bart.