linux-kernel - [PATCH 1/1] drm/amdgpu: initialize amdgpu_cgs_acpi_eval

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Message-Id: <20160618205500.23415-1-nicolas.iooss_linux@m4x.org>
Date:	Sat, 18 Jun 2016 22:55:00 +0200
From:	Nicolas Iooss <nicolas.iooss_linux@....org>
To:	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org
Cc:	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	Nicolas Iooss <nicolas.iooss_linux@....org>,
	stable@...r.kernel.org
Subject: [PATCH 1/1] drm/amdgpu: initialize amdgpu_cgs_acpi_eval_object result value

amdgpu_cgs_acpi_eval_object() returned the value of variable "result"
without initializing it first.

This bug has been found by compiling the kernel with clang.  The
compiler complained:

    drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c:972:14: error: variable
    'result' is used uninitialized whenever 'for' loop exits because its
    condition is false [-Werror,-Wsometimes-uninitialized]
            for (i = 0; i < count; i++) {
                        ^~~~~~~~~
    drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c:1011:9: note: uninitialized
    use occurs here
            return result;
                   ^~~~~~
    drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c:972:14: note: remove the
    condition if it is always true
            for (i = 0; i < count; i++) {
                        ^~~~~~~~~
    drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c:864:12: note: initialize the
    variable 'result' to silence this warning
            int result;
                      ^
                       = 0

Fixes: 3f1d35a03b3c ("drm/amdgpu: implement new cgs interface for acpi
function")
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@....org>
Cc: stable@...r.kernel.org
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
index 8943099eb135..cf6f49fc1c75 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
@@ -909,7 +909,7 @@ static int amdgpu_cgs_acpi_eval_object(struct cgs_device *cgs_device,
 	struct cgs_acpi_method_argument *argument = NULL;
 	uint32_t i, count;
 	acpi_status status;
-	int result;
+	int result = 0;
 	uint32_t func_no = 0xFFFFFFFF;
 
 	handle = ACPI_HANDLE(&adev->pdev->dev);
-- 
2.8.3