Re: [PATCH v3 09/23] scsi: sd: Do not issue commands to suspended disks on shutdown

[Hannes Reinecke <hare@suse.de>]

On 9/15/23 10:14, 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.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
> ---
>   drivers/scsi/sd.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 1d106c8ad5af..d86306d42445 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -3727,7 +3727,8 @@ static int sd_remove(struct device *dev)
>   
>   	device_del(&sdkp->disk_dev);
>   	del_gendisk(sdkp->disk);
> -	sd_shutdown(dev);
> +	if (sdkp->device->sdev_state == SDEV_RUNNING)
> +		sd_shutdown(dev);
>   
>   	put_disk(sdkp->disk);
>   	return 0;
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@suse.de			                  +49 911 74053 688
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