media: i2c: fix an uninitialized error code

Clang points out that the error handling in ov02a10_s_stream() is
broken, and just returns a random error code:

drivers/media/i2c/ov02a10.c:537:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
        if (ov02a10->streaming == on)
            ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/media/i2c/ov02a10.c:568:9: note: uninitialized use occurs here
        return ret;
               ^~~
drivers/media/i2c/ov02a10.c:537:2: note: remove the 'if' if its condition is always false
        if (ov02a10->streaming == on)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

If streaming is already on, leave it that way and return success.

Suggested-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
Fixes: 91807efbe8ec ("media: i2c: add OV02A10 image sensor driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/i2c/ov02a10.c b/drivers/media/i2c/ov02a10.c
index 3917181..8683ffd 100644 (file)
--- a/drivers/media/i2c/ov02a10.c
+++ b/drivers/media/i2c/ov02a10.c
@@ -534,8 +534,10 @@ static int ov02a10_s_stream(struct v4l2_subdev *sd, int on)
 
        mutex_lock(&ov02a10->mutex);
 
-       if (ov02a10->streaming == on)
+       if (ov02a10->streaming == on) {
+               ret = 0;
                goto unlock_and_return;
+       }
 
        if (on) {
                ret = pm_runtime_get_sync(&client->dev);