BUG: return from function without mutex_unlock in drivers/media/video/cx231xx/cx231xx-core.c

	KERNEL_VERSION: 2.6.36
        SUBJECT: return from function without mutex_unlock   in 

drivers/media/video/cx231xx/cx231xx-core.c

SUBSCRIBE:
1. In line 282 in function cx231xx_read_ctrl_reg mutex was locked.
2. If usb_control_msg returns ret<0 then we exit from function cx231xx_read_ctrl_reg without unlocking mutex. In other (ret>=0) case mutex has been unlocked before exiting in line 295.

282 mutex_lock(&dev->ctrl_urb_lock);
283 ret = usb_control_msg(dev->udev, pipe, req,
284 USB_DIR_IN | USB_TYPE_VENDOR |
USB_RECIP_DEVICE,
285 val, reg, dev->urb_buf, len, HZ);
286 if (ret < 0) {

 287                cx231xx_isocdbg(" failed!\n");
 288                /* mutex_unlock(&dev->ctrl_urb_lock); */
 289                return ret;

290 }
291
292 if (len)
293 memcpy(buf, dev->urb_buf, len);
294
295 mutex_unlock(&dev->ctrl_urb_lock);

Found by Linux Device Drivers Verification Project