Re: [PATCH v4 09/23] scsi: sd: Do not issue commands to suspended disks on shutdown

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On 9/20/23 06:54, Damien Le Moal wrote:
If an error occurs when resuming a host adapter before the devices
attached to the adapter are resumed, the adapter low level driver may
remove the scsi host, resulting in a call to sd_remove() for the
disks of the host. This in turn results in a call to sd_shutdown() which
will issue a synchronize cache command and a start stop unit command to
spindown the disk. sd_shutdown() issues the commands only if the device
is not already suspended but does not check the power state for
system-wide suspend/resume. That is, the commands may be issued with the
device in a suspended state, which causes PM resume to hang, forcing a
reset of the machine to recover.

Fix this by not calling sd_shutdown() in sd_remove() if the device
is not running.

Hi Damien,

I'd like to look into an alternative fix (after this patch series went in) but I couldn't identify the call chain in the ATA resume code that results in removal of the SCSI host. Can you please show me the call chain that results in SCSI host removal if resuming fails?



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