linux-kernel - [PATCH 3.4 102/125] USB: ipaq.c: fix a timeout loop

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Date:   Wed, 12 Oct 2016 20:33:38 +0800
From:   lizf@...nel.org
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 102/125] USB: ipaq.c: fix a timeout loop

From: Dan Carpenter <dan.carpenter@...cle.com>

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit abdc9a3b4bac97add99e1d77dc6d28623afe682b upstream.

The code expects the loop to end with "retries" set to zero but, because
it is a post-op, it will end set to -1.  I have fixed this by moving the
decrement inside the loop.

Fixes: 014aa2a3c32e ('USB: ipaq: minor ipaq_open() cleanup.')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/usb/serial/ipaq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/ipaq.c b/drivers/usb/serial/ipaq.c
index 10c02b8..af019a8 100644
--- a/drivers/usb/serial/ipaq.c
+++ b/drivers/usb/serial/ipaq.c
@@ -550,7 +550,8 @@ static int ipaq_open(struct tty_struct *tty,
 	 * through. Since this has a reasonably high failure rate, we retry
 	 * several times.
 	 */
-	while (retries--) {
+	while (retries) {
+		retries--;
 		result = usb_control_msg(serial->dev,
 				usb_sndctrlpipe(serial->dev, 0), 0x22, 0x21,
 				0x1, 0, NULL, 0, 100);
-- 
1.9.1