linux-kernel - [PATCH] usb: gadget: storage_common: use kstrto*() [bug fix]

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Date:	Thu, 14 Apr 2011 11:55:43 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: storage_common: use kstrto*() [bug fix]

This commit fixes an embarrassing bug in the "storage_common:
use kstrto*()" patch which caused fsg_store_ro() to return
zero instead of the length of the consumed buffer.

Signed-off-by: Michal Nazarewicz <mina86@...a86.com>
---
 drivers/usb/gadget/storage_common.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

On Thu, 14 Apr 2011 04:16:35 +0200, Greg KH <gregkh@...e.de> wrote:
> Ugh, I applied the first one already :(

Yes, I hoped you could quickly replace the patch without anyone
noticing.

> Care to send a follow-on patch that fixes this properly?

Natuarry.

diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 109635a..1fa4f70 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -708,7 +708,7 @@ static ssize_t fsg_show_file(struct device *dev, struct device_attribute *attr,
 static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
 			    const char *buf, size_t count)
 {
-	ssize_t		rc = count;
+	ssize_t		rc;
 	struct fsg_lun	*curlun = fsg_lun_from_dev(dev);
 	struct rw_semaphore	*filesem = dev_get_drvdata(dev);
 	unsigned	ro;
@@ -729,6 +729,7 @@ static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
 		curlun->ro = ro;
 		curlun->initially_ro = ro;
 		LDBG(curlun, "read-only status set to %d\n", curlun->ro);
+		rc = count;
 	}
 	up_read(filesem);
 	return rc;
-- 
1.7.3.1

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