From ea6a69defd3311014d8a0ea89245410593c8d00c Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 21 Apr 2017 07:51:21 -0300 Subject: [PATCH] [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 Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/rainshadow-cec/rainshadow-cec.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/rainshadow-cec/rainshadow-cec.c b/drivers/media/usb/rainshadow-cec/rainshadow-cec.c index dc1f64f904cd..9ddd6a99f066 100644 --- 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);