[PATCH v4 6/6] scsi: ufs: core: Do not release a reserved request in ufshcd_abort()

[Stanley Jhu <stanleyjhu@google.com>]

In SDB mode, aborting a timed-out device management request drops a
clock hold that the request never took:

1. ufshcd_dev_man_lock() takes one ufshcd_hold() for the whole device
   management command. ufshcd_queue_reserved_command() submits the
   request without taking a hold of its own.
2. The request times out and ufshcd_abort() clears its slot with
   ufshcd_clear_cmd().
3. ufshcd_abort() claims BIT(tag) in hba->outstanding_reqs and calls
   ufshcd_release_scsi_cmd(), which calls ufshcd_release() for a hold
   the request never took.
4. When ufshcd_dev_man_unlock() drops the hold from step 1,
   hba->clk_gating.active_reqs goes below zero.

Release the command only if it is a SCSI command.

Fixes: 08b12cda6c44 ("scsi: ufs: core: Switch to scsi_get_internal_cmd()")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/2060a8da-581b-46d1-a510-779f4df716cd@acm.org
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Stanley Jhu <stanleyjhu@google.com>
---
 drivers/ufs/core/ufshcd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 4f9b34c1d112..49a981b8cc32 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8239,7 +8239,8 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
 	 * Clear the corresponding bit from outstanding_reqs since the command
 	 * has been aborted successfully.
 	 */
-	if (ufshcd_clear_outstanding_reqs(hba, BIT(tag)))
+	if (ufshcd_clear_outstanding_reqs(hba, BIT(tag)) &&
+	    ufshcd_is_scsi_cmd(cmd))
 		ufshcd_release_scsi_cmd(hba, cmd);
 
 	err = SUCCESS;
-- 
2.56.0.212.g129ede20d9-goog