On 8/17/24 10:50, Yihang Li wrote:
If formatting a suspended disk (such as formatting with different DIF type), the disk will be resuming first, and then the format command will submit to the disk through SG_IO ioctl.
When the disk is processing the format command, the system does not submit other commands to the disk. Therefore, the system attempts to suspend the disk again and sends the SYNC CACHE command. However, the SYNC CACHE
Why would the system try to suspend the disk with a request in flight ? Sounds like there is a bug with PM reference counting, no ?
command will fail because the disk is in the formatting process, which will cause the runtime_status of the disk to error and it is difficult for user to recover it. Error info like:
[ 669.925325] sd 6:0:6:0: [sdg] Synchronizing SCSI cache [ 670.202371] sd 6:0:6:0: [sdg] Synchronize Cache(10) failed: Result: hostbyte=0x00 driverbyte=DRIVER_OK [ 670.216300] sd 6:0:6:0: [sdg] Sense Key : 0x2 [current] [ 670.221860] sd 6:0:6:0: [sdg] ASC=0x4 ASCQ=0x4
To solve the issue, retry the command until format command is finished.
Cc: stable@vger.kernel.org Signed-off-by: Yihang Li liyihang9@huawei.com Reviewed-by: Bart Van Assche bvanassche@acm.org
Changes since v3:
- Add Cc tag for kernel stable.
Changes since v2:
- Add Reviewed-by for Bart.
Changes since v1:
- Updated and added error information to the patch description.
drivers/scsi/sd.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index adeaa8ab9951..5cd88a8eea73 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1823,6 +1823,11 @@ static int sd_sync_cache(struct scsi_disk *sdkp) (sshdr.asc == 0x74 && sshdr.ascq == 0x71)) /* drive is password locked */ /* this is no error here */ return 0;
/* retry if format in progress */if (sshdr.asc == 0x4 && sshdr.ascq == 0x4)return -EBUSY;/* * This drive doesn't support sync and there's not much * we can do because this is called during shutdown