linux-kernel - [PATCH AUTOSEL 5.15 29/41] scsi: ufs: Use generic error code in ufshcd_set_dev_pwr

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Date:   Thu,  3 Feb 2022 15:32:33 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kiwoong Kim <kwmad.kim@...sung.com>,
        Bart Van Assche <bvanassche@....org>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>, jejb@...ux.ibm.com,
        beanhuo@...ron.com, avri.altman@....com, daejun7.park@...sung.com,
        adrian.hunter@...el.com, cang@...eaurora.org,
        asutoshd@...eaurora.org, linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 29/41] scsi: ufs: Use generic error code in ufshcd_set_dev_pwr_mode()

From: Kiwoong Kim <kwmad.kim@...sung.com>

[ Upstream commit ad6c8a426446873febc98140d81d5353f8c0825b ]

The return value of ufshcd_set_dev_pwr_mode() is passed to device PM
core. However, the function currently returns a SCSI result which the PM
core doesn't understand.  This might lead to unexpected behaviors in
userland; a platform reset was observed in Android.

Use a generic error code for SSU failures.

Link: https://lore.kernel.org/r/1642743182-54098-1-git-send-email-kwmad.kim@samsung.com
Reviewed-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/ufs/ufshcd.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ae7bdd8703198..f489954e46321 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8473,7 +8473,7 @@ static void ufshcd_hba_exit(struct ufs_hba *hba)
  * @pwr_mode: device power mode to set
  *
  * Returns 0 if requested power mode is set successfully
- * Returns non-zero if failed to set the requested power mode
+ * Returns < 0 if failed to set the requested power mode
  */
 static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
 				     enum ufs_dev_pwr_mode pwr_mode)
@@ -8527,8 +8527,11 @@ static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
 		sdev_printk(KERN_WARNING, sdp,
 			    "START_STOP failed for power mode: %d, result %x\n",
 			    pwr_mode, ret);
-		if (ret > 0 && scsi_sense_valid(&sshdr))
-			scsi_print_sense_hdr(sdp, NULL, &sshdr);
+		if (ret > 0) {
+			if (scsi_sense_valid(&sshdr))
+				scsi_print_sense_hdr(sdp, NULL, &sshdr);
+			ret = -EIO;
+		}
 	}
 
 	if (!ret)
-- 
2.34.1