[PATCH v4 06/10] scsi: ufs: Reduce the START STOP UNIT timeout

Bart Van Assche
2022-10-18T20:31:20Z

Reduce the START STOP UNIT command timeout to one second since on Android
devices a kernel panic is triggered if an attempt to suspend the system
takes more than 20 seconds. One second should be enough for the START
STOP UNIT command since this command completes in less than a millisecond
for the UFS devices I have access to.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/ufs/core/ufshcd.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index db1997e99da2..f83a0045a129 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8746,8 +8746,6 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
struct scsi_device *sdp;
unsigned long flags;
int ret, retries;
- unsigned long deadline;
- int32_t remaining;

spin_lock_irqsave(hba->host->host_lock, flags);
sdp = hba->ufs_device_wlun;
@@ -8775,14 +8773,9 @@ 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.
*/
- deadline = jiffies + 10 * HZ;
for (retries = 3; retries > 0; --retries) {
- ret = -ETIMEDOUT;
- remaining = deadline - jiffies;
- if (remaining <= 0)
- break;
ret = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
- remaining / HZ, 0, 0, RQF_PM, NULL);
+ HZ, 0, 0, RQF_PM, NULL);
if (!scsi_status_is_check_condition(ret) ||
!scsi_sense_valid(&sshdr) ||
sshdr.sense_key != UNIT_ATTENTION)