linux-kernel - [PATCH 3.10 190/319] em28xx-i2c: rt_mutex

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Date:   Sun,  5 Feb 2017 20:20:12 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 190/319] em28xx-i2c: rt_mutex_trylock() returns zero on failure

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

commit e44c153b30c9a0580fc2b5a93f3c6d593def2278 upstream.

The code is checking for negative returns but it should be checking for
zero.

Fixes: aab3125c43d8 ('[media] em28xx: add support for registering multiple i2c buses')

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/media/usb/em28xx/em28xx-i2c.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
index c4ff973..d28d906 100644
--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -469,9 +469,8 @@ static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
 	int addr, rc, i;
 	u8 reg;
 
-	rc = rt_mutex_trylock(&dev->i2c_bus_lock);
-	if (rc < 0)
-		return rc;
+	if (!rt_mutex_trylock(&dev->i2c_bus_lock))
+		return -EAGAIN;
 
 	/* Switch I2C bus if needed */
 	if (bus != dev->cur_i2c_bus &&
-- 
2.8.0.rc2.1.gbe9624a