[PATCH 4.4 55/93] [media] em28xx-i2c: rt_mutex_trylock() returns zero on failure

From: Greg Kroah-Hartman
Date: Thu Oct 06 2016 - 05:14:59 EST


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

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

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/media/usb/em28xx/em28xx-i2c.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -507,9 +507,8 @@ static int em28xx_i2c_xfer(struct i2c_ad
if (dev->disconnected)
return -ENODEV;

- 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 &&