linux-kernel - [PATCH 3.12 095/142] scsi_sysfs: Fix queue_ramp_up

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Message-Id: <54c4a58c53228f430a01bd75bf78a9d167c428f3.1456308281.git.jslaby@suse.cz>
Date:	Wed, 24 Feb 2016 11:04:50 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 095/142] scsi_sysfs: Fix queue_ramp_up_period return code

From: Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 863e02d0e173bb9d8cea6861be22820b25c076cc upstream.

Writing a number to /sys/bus/scsi/devices/<sdev>/queue_ramp_up_period
returns the value of that number instead of the number of bytes written.
This behavior can confuse programs expecting POSIX write() semantics.
Fix this by returning the number of bytes written instead.

Signed-off-by: Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: Matthew R. Ochs <mrochs@...ux.vnet.ibm.com>
Reviewed-by: Ewan D. Milne <emilne@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/scsi/scsi_sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 678a9f96588a..9394675a87ae 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -829,7 +829,7 @@ sdev_store_queue_ramp_up_period(struct device *dev,
 		return -EINVAL;
 
 	sdev->queue_ramp_up_period = msecs_to_jiffies(period);
-	return period;
+	return count;
 }
 
 static struct device_attribute sdev_attr_queue_ramp_up_period =
-- 
2.7.1