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BACKPORT: FROMGIT: scsi: ufs: core: Retry START_STOP on UNIT_ATTENTION

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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.

Bug: 194712579
Link: https://lore.kernel.org/r/20211001182015.1347587-2-jaegeuk@kernel.org
(cherry picked from commit af21c3fd5b3ec540a97b367a70b26616ff7e0c55
    git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next)
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>
Change-Id: I7e639d89ae9fbd5ff0f1b3a6e5cbe77682ebefc0
This commit is contained in:
Jaegeuk Kim
2021-09-30 11:12:50 -07:00
committed by Jaegeuk Kim
parent f0ad57ddd7
commit 2b411f1257
2 changed files with 24 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/scsi/ufs/ufshcd.c
View File

@@ -8573,7 +8573,7 @@ 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;
@@ -8607,8 +8607,14 @@ 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",

15
include/scsi/scsi.h
View File

@@ -88,6 +88,21 @@ static inline int scsi_is_wlun(u64 lun)
return (lun & 0xff00) == SCSI_W_LUN_BASE;
}
/**
* scsi_status_is_check_condition - check the status return.
*
* @status: the status passed up from the driver (including host and
* driver components)
*
* This returns true if the status code is SAM_STAT_CHECK_CONDITION.
*/
static inline int scsi_status_is_check_condition(int status)
{
if (status < 0)
return false;
status &= 0xfe;
return status == SAM_STAT_CHECK_CONDITION;
}
/*
* MESSAGE CODES