openwrt/target/linux/bcm27xx/patches-5.15/950-0674-media-bcm2835-unicam-Set-ret-on-error-path-in-unicam.patch

From 0cc1acc72364d72e8cae56ad6eea797bad00e3c5 Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <nathan@kernel.org>
Date: Mon, 31 Jan 2022 17:23:38 -0700
Subject: [PATCH] media: bcm2835-unicam: Set ret on error path in
 unicam_async_complete()

Clang warns:

  drivers/media/platform/bcm2835/bcm2835-unicam.c:3109:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
          if (!source_pads) {
              ^~~~~~~~~~~~
  drivers/media/platform/bcm2835/bcm2835-unicam.c:3152:9: note: uninitialized use occurs here
          return ret;
                 ^~~
  drivers/media/platform/bcm2835/bcm2835-unicam.c:3109:2: note: remove the 'if' if its condition is always false
          if (!source_pads) {
          ^~~~~~~~~~~~~~~~~~~
  drivers/media/platform/bcm2835/bcm2835-unicam.c:3091:9: note: initialize the variable 'ret' to silence this warning
          int ret;
                 ^
                  = 0
  1 warning generated.

When the if condition is true, ret will be used uninitialized, which
could result in undesirable behavior. Set ret to -ENODEV on the error
path, which is a standard error code for the ->complete() callback.

Fixes: d056e86eb35f ("media/bcm2835-unicam: Parse pad numbers correctly")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 drivers/media/platform/bcm2835/bcm2835-unicam.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
@@ -3109,6 +3109,7 @@ static int unicam_async_complete(struct
 	}
 	if (!source_pads) {
 		unicam_err(unicam, "No source pads on sensor.\n");
+		ret = -ENODEV;
 		goto unregister;
 	}