From 39ad07b7de82bff26118a69e680cda3d081392dc Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Tue, 19 Dec 2017 06:43:37 -0500 Subject: [PATCH] media: s5c73m3-core: fix logic on a timeout condition As warned by smatch: drivers/media/i2c/s5c73m3/s5c73m3-core.c:268 s5c73m3_check_status() error: uninitialized symbol 'status'. if s5c73m3_check_status() is called too late, time_is_after_jiffies(end) will return 0, causing the while to abort before reading status. The current code will do the wrong thing here, as it will still check if status != value. The right fix here is to change the logic to ensure that it will always read the status. Suggested-by: Andrzej Hajda Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/s5c73m3/s5c73m3-core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-core.c b/drivers/media/i2c/s5c73m3/s5c73m3-core.c index cdc4f2392ef9..ce196b60f917 100644 --- a/drivers/media/i2c/s5c73m3/s5c73m3-core.c +++ b/drivers/media/i2c/s5c73m3/s5c73m3-core.c @@ -248,17 +248,17 @@ static int s5c73m3_check_status(struct s5c73m3 *state, unsigned int value) { unsigned long start = jiffies; unsigned long end = start + msecs_to_jiffies(2000); - int ret = 0; + int ret; u16 status; int count = 0; - while (time_is_after_jiffies(end)) { + do { ret = s5c73m3_read(state, REG_STATUS, &status); if (ret < 0 || status == value) break; usleep_range(500, 1000); ++count; - } + } while (time_is_after_jiffies(end)); if (count > 0) v4l2_dbg(1, s5c73m3_dbg, &state->sensor_sd, -- 2.39.5