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From:   Nathan Chancellor <nathan@kernel.org>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>, linux-media@vger.kernel.org,
        linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
        patches@lists.linux.dev, Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH] media: rzg2l-cru: Remove unnecessary shadowing of ret in rzg2l_csi2_s_stream()
Date:   Sun, 27 Nov 2022 23:16:22 -0700
Message-Id: <20221128061622.1470489-1-nathan@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Clang warns:

  drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:445:7: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
                  if (ret)
                      ^~~
  drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:475:9: note: uninitialized use occurs here
          return ret;
                ^~~
  drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:445:3: note: remove the 'if' if its condition is always false
                  if (ret)
                  ^~~~~~~~
  drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:441:7: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
                  if (ret)
                      ^~~
  drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:475:9: note: uninitialized use occurs here
          return ret;
                ^~~
  drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:441:3: note: remove the 'if' if its condition is always false
                  if (ret)
                  ^~~~~~~~
  drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:431:9: note: initialize the variable 'ret' to silence this warning
          int ret;
                ^
                  = 0
  2 errors generated.

ret is unnecessarily shadowed, meaning the assignments to ret within the
first 'if (enable)' block are only applied to the inner scope, not the
outer one as intended. Remove the shadowing to fix the warnings and make
everything work correctly.

Fixes: 51e8415e39a9 ("media: platform: Add Renesas RZ/G2L MIPI CSI-2 receiver driver")
Link: https://github.com/ClangBuiltLinux/linux/issues/1764
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
index aa752b80574c..3deb09be6400 100644
--- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c
@@ -431,8 +431,6 @@ static int rzg2l_csi2_s_stream(struct v4l2_subdev *sd, int enable)
 	int ret;
 
 	if (enable) {
-		int ret;
-
 		ret = pm_runtime_resume_and_get(csi2->dev);
 		if (ret)
 			return ret;

base-commit: 6a5a4514854a637d01c50f5ea17b28f78b31ddb8
-- 
2.38.1