[media] rainshadow-cec: avoid -Wmaybe-uninitialized warning

The barrier implied by spin_unlock() in rain_irq_work_handler makes it hard
for gcc to figure out the state of the variables, leading to a false-positive
warning:

drivers/media/usb/rainshadow-cec/rainshadow-cec.c: In function 'rain_irq_work_handler':
drivers/media/usb/rainshadow-cec/rainshadow-cec.c:171:31: error: 'data' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Slightly rearranging the code makes it easier for the compiler to see that the
code is correct, and gets rid of the warning.

Fixes: 0f314f6c2e77 ("[media] rainshadow-cec: new RainShadow Tech HDMI CEC driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/usb/rainshadow-cec/rainshadow-cec.c b/drivers/media/usb/rainshadow-cec/rainshadow-cec.c
index dc1f64f904cd177a19059ac049bdcf879bea251f..9ddd6a99f066bd557787af2e708ba413a6d920e5 100644 (file)
--- a/drivers/media/usb/rainshadow-cec/rainshadow-cec.c
+++ b/drivers/media/usb/rainshadow-cec/rainshadow-cec.c
@@ -123,11 +123,12 @@ static void rain_irq_work_handler(struct work_struct *work)
                char data;
 
                spin_lock_irqsave(&rain->buf_lock, flags);
-               exit_loop = rain->buf_len == 0;
                if (rain->buf_len) {
                        data = rain->buf[rain->buf_rd_idx];
                        rain->buf_len--;
                        rain->buf_rd_idx = (rain->buf_rd_idx + 1) & 0xff;
+               } else {
+                       exit_loop = true;
                }
                spin_unlock_irqrestore(&rain->buf_lock, flags);