This is a note to let you know that I've just added the patch titled
scsi: ufs: core: Retry START_STOP on UNIT_ATTENTION
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-ufs-core-retry-start_stop-on-unit_attention.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From af21c3fd5b3ec540a97b367a70b26616ff7e0c55 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Date: Fri, 1 Oct 2021 11:20:14 -0700
Subject: scsi: ufs: core: Retry START_STOP on UNIT_ATTENTION
From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
commit af21c3fd5b3ec540a97b367a70b26616ff7e0c55 upstream.
Commit 57d104c153d3 ("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@xxxxxxxxxx
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8477,7 +8477,7 @@ static int ufshcd_set_dev_pwr_mode(struc
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;
@@ -8510,8 +8510,14 @@ static int ufshcd_set_dev_pwr_mode(struc
* 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",
Patches currently in stable-queue which might be from jaegeuk@xxxxxxxxxx are
queue-5.15/scsi-ufs-core-retry-start_stop-on-unit_attention.patch
