From 573172b7b51a5b955627bd3d0cde5b2d2c4f9441 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Mon, 31 Jan 2022 17:50:43 -0700 Subject: [PATCH] media: i2c: ov9281: Initialize id_msb to zero in ov9281_check_sensor_id() Clang warns: drivers/media/i2c/ov9281.c:1132:6: warning: variable 'id_msb' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (!ret) ^~~~ drivers/media/i2c/ov9281.c:1135:9: note: uninitialized use occurs here id |= (id_msb << 8); ^~~~~~ drivers/media/i2c/ov9281.c:1132:2: note: remove the 'if' if its condition is always true if (!ret) ^~~~~~~~~ drivers/media/i2c/ov9281.c:1127:20: note: initialize the variable 'id_msb' to silence this warning u32 id = 0, id_msb; ^ = 0 1 warning generated. If the first ov9281_read_reg() call fails, id_msb will be used uninitialized. However, this warning does not actually matter in practice because the value of id is not used when either call to ov9281_read_reg() fails, as the boolean OR will short circuit due to the ret condition being checked first. Regardless, it is not good to use variables uninitialized so silence the warning by initializing id_msb to 0, as was done with id. Fixes: 20855581e0eb ("media: i2c: ov9281: Read chip ID via 2 reads") Signed-off-by: Nathan Chancellor --- drivers/media/i2c/ov9281.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/media/i2c/ov9281.c +++ b/drivers/media/i2c/ov9281.c @@ -1124,7 +1124,7 @@ static int ov9281_check_sensor_id(struct struct i2c_client *client) { struct device *dev = &ov9281->client->dev; - u32 id = 0, id_msb; + u32 id = 0, id_msb = 0; int ret; ret = ov9281_read_reg(client, OV9281_REG_CHIP_ID + 1,