[PATCH 4/6] [media] st-rc: prevent a endless loop

[Mauro Carvalho Chehab]

As warned by smatch:
	drivers/media/rc/st_rc.c:110 st_rc_rx_interrupt() warn: this loop depends on readl() succeeding

as readl() might fail, with likely means some unrecovered error,
let's loop only if it succeeds.

Signed-off-by: Mauro Carvalho Chehab <mchehab at osg.samsung.com>
---
 drivers/media/rc/st_rc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/rc/st_rc.c b/drivers/media/rc/st_rc.c
index 1fa0c9d1c508..151bfe2aea55 100644
--- a/drivers/media/rc/st_rc.c
+++ b/drivers/media/rc/st_rc.c
@@ -99,7 +99,7 @@ static irqreturn_t st_rc_rx_interrupt(int irq, void *data)
 	unsigned int symbol, mark = 0;
 	struct st_rc_device *dev = data;
 	int last_symbol = 0;
-	u32 status;
+	int status;
 	DEFINE_IR_RAW_EVENT(ev);
 
 	if (dev->irq_wake)
@@ -107,7 +107,7 @@ static irqreturn_t st_rc_rx_interrupt(int irq, void *data)
 
 	status  = readl(dev->rx_base + IRB_RX_STATUS);
 
-	while (status & (IRB_FIFO_NOT_EMPTY | IRB_OVERFLOW)) {
+	while (status > 0 && (status & (IRB_FIFO_NOT_EMPTY | IRB_OVERFLOW))) {
 		u32 int_status = readl(dev->rx_base + IRB_RX_INT_STATUS);
 		if (unlikely(int_status & IRB_RX_OVERRUN_INT)) {
 			/* discard the entire collection in case of errors!  */
-- 
2.5.0