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scsi: ufs: core: Retry START_STOP on UNIT_ATTENTION 

Commit 57d104c153 ("ufs: add UFS power management support") made the UFS
driver submit a REQUEST SENSE command before submitting a power management
command to a WLUN to clear the POWER ON unit attention. Instead of
submitting a REQUEST SENSE command before submitting a power management
command, retry the power management command until it succeeds.

This is the preparation to get rid of all UNIT ATTENTION code which should
be handled by users.

Link: https://lore.kernel.org/r/20211001182015.1347587-2-jaegeuk@kernel.org
Cc: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Jaegeuk Kim 2021-10-01 11:20:14 -07:00 committed by Martin K. Petersen
parent f44abcfc3f
commit af21c3fd5b
1 changed files with 9 additions and 3 deletions
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12
drivers/scsi/ufs/ufshcd.c
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@ -8675,7 +8675,7 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
struct scsi_sense_hdr sshdr;
struct scsi_device *sdp;
unsigned long flags;
int ret;
int ret, retries;
spin_lock_irqsave(hba->host->host_lock, flags);
sdp = hba->sdev_ufs_device;
@ -8710,8 +8710,14 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
* callbacks hence set the RQF_PM flag so that it doesn't resume the
* already suspended childs.
*/
ret = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
START_STOP_TIMEOUT, 0, 0, RQF_PM, NULL);
for (retries = 3; retries > 0; --retries) {
ret = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
START_STOP_TIMEOUT, 0, 0, RQF_PM, NULL);
if (!scsi_status_is_check_condition(ret) ||
!scsi_sense_valid(&sshdr) ||
sshdr.sense_key != UNIT_ATTENTION)
break;
}
if (ret) {
sdev_printk(KERN_WARNING, sdp,
"START_STOP failed for power mode: %d, result %x\n",