usb_control_msg returns in case of a successfully sent message the number of sent bytes as a positive number. Don't use this value as a return value for stk_camera_read_reg, as a non-zero return value is used as an error condition in some cases when stk_camera_read_reg is called. Signed-off-by: Andreas Pape <ap@xxxxxxxxxx> --- drivers/media/usb/stkwebcam/stk-webcam.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c index c64928e36a5a..66a3665fc826 100644 --- a/drivers/media/usb/stkwebcam/stk-webcam.c +++ b/drivers/media/usb/stkwebcam/stk-webcam.c @@ -171,7 +171,11 @@ int stk_camera_read_reg(struct stk_camera *dev, u16 index, u8 *value) *value = *buf; kfree(buf); - return ret; + + if (ret < 0) + return ret; + else + return 0; } static int stk_start_stream(struct stk_camera *dev) -- 2.17.1
