linux-kernel - [PATCH v2 1/2] scsi: ufs: print helpful hint when response size exceed buffer size

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Message-Id: <20191112223436.27449-2-huobean@gmail.com>
Date:   Tue, 12 Nov 2019 23:34:35 +0100
From:   Bean Huo <huobean@...il.com>
To:     alim.akhtar@...sung.com, avri.altman@....com,
        pedrom.sousa@...opsys.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] scsi: ufs: print helpful hint when response size exceed buffer size

From: Bean Huo <beanhuo@...ron.com>

Print out returned response size and buffer size, while the front one
is bigger than the back one.

Signed-off-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
Reviewed-by: Bart Van Assche <bvanassche@....org>
---
 drivers/scsi/ufs/ufshcd.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 9cbe3b45cf1c..527bd3b4f834 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1938,8 +1938,8 @@ int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 			memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
 		} else {
 			dev_warn(hba->dev,
-				"%s: Response size is bigger than buffer",
-				__func__);
+				 "%s: rsp size %d is bigger than buffer size %d",
+				 __func__, resp_len, buf_len);
 			return -EINVAL;
 		}
 	}
@@ -5864,7 +5864,9 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 			memcpy(desc_buff, descp, resp_len);
 			*buff_len = resp_len;
 		} else {
-			dev_warn(hba->dev, "rsp size is bigger than buffer");
+			dev_warn(hba->dev,
+				 "%s: rsp size %d is bigger than buffer size %d",
+				 __func__, resp_len, *buff_len);
 			*buff_len = 0;
 			err = -EINVAL;
 		}
-- 
2.17.1