linux-kernel - [PATCH 3/5] media: v4l2-flash-led-class: drop an useless check

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Date:   Mon, 21 Jun 2021 13:56:47 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: [PATCH 3/5] media: v4l2-flash-led-class: drop an useless check

As pointed by smatch:
	drivers/media/v4l2-core/v4l2-flash-led-class.c:264 v4l2_flash_s_ctrl() error: we previously assumed 'fled_cdev' could be null (see line 197)

It is too late to check if fled_cdev is NULL there. If such check is
needed, it should be, instead, inside v4l2_flash_init().

On other words, if v4l2_flash->fled_cdev() is NULL at
v4l2_flash_s_ctrl(), all led_*() function calls inside the function
would try to de-reference a NULL pointer, as the logic won't prevent
it.

So, remove the useless check.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/media/v4l2-core/v4l2-flash-led-class.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-flash-led-class.c b/drivers/media/v4l2-core/v4l2-flash-led-class.c
index 10ddcc48aa17..a1653c635d82 100644
--- a/drivers/media/v4l2-core/v4l2-flash-led-class.c
+++ b/drivers/media/v4l2-core/v4l2-flash-led-class.c
@@ -194,7 +194,7 @@ static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
 {
 	struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
 	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
-	struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
 	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 	bool external_strobe;
 	int ret = 0;
-- 
2.31.1