linux-kernel - [PATCH v3] scsi: ufs: use an generic error code in ufshcd_set_dev_pwr

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Date:   Fri, 21 Jan 2022 14:33:02 +0900
From:   Kiwoong Kim <kwmad.kim@...sung.com>
To:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        alim.akhtar@...sung.com, avri.altman@....com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, beanhuo@...ron.com,
        cang@...eaurora.org, adrian.hunter@...el.com, sc.suh@...sung.com,
        hy50.seo@...sung.com, sh425.lee@...sung.com,
        bhoon95.kim@...sung.com, vkumar.1997@...sung.com
Cc:     Kiwoong Kim <kwmad.kim@...sung.com>
Subject: [PATCH v3] scsi: ufs: use an generic error code in
 ufshcd_set_dev_pwr_mode

v2 -> v3: change the value of ret only if it's positive
v1 -> v2: modify the comment of ufshcd_set_dev_pwr_mode

The return value of ufshcd_set_dev_pwr_mode is given to
device pm core. However, the function currently returns a result
in scsi command and the device pm core doesn't understand it.
It might lead to unexpected behaviors of user land. I found
the return value led to platform reset in Android.

This patch is to use an generic code for SSU failures.

Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
---
 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 1049e41..25e08a3 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -8613,7 +8613,7 @@ 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)
@@ -8667,8 +8667,11 @@ 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)
-- 
2.7.4