linux-kernel - [PATCH][next] drm/amdgpu: fix return of an uninitialized value in variable ret

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Message-Id: <20190510100842.30458-1-colin.king@canonical.com>
Date:   Fri, 10 May 2019 11:08:42 +0100
From:   Colin King <colin.king@...onical.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/amdgpu: fix return of an uninitialized value in variable ret

From: Colin Ian King <colin.king@...onical.com>

In the case where is_enable is false and lo_base_addr is non-zero the
variable ret has not been initialized and is being checked for non-zero
and potentially garbage is being returned. Fix this by not returning
ret but instead returning -EINVAL on the zero lo_base_addr case.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: a6ac0b44bab9 ("drm/amdgpu: add df perfmon regs and funcs for xgmi")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/amdgpu/df_v3_6.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/df_v3_6.c b/drivers/gpu/drm/amd/amdgpu/df_v3_6.c
index a5c3558869fb..8c09bf994acd 100644
--- a/drivers/gpu/drm/amd/amdgpu/df_v3_6.c
+++ b/drivers/gpu/drm/amd/amdgpu/df_v3_6.c
@@ -398,10 +398,7 @@ static int df_v3_6_start_xgmi_link_cntr(struct amdgpu_device *adev,
 				NULL);
 
 		if (lo_base_addr == 0)
-			ret = -EINVAL;
-
-		if (ret)
-			return ret;
+			return -EINVAL;
 
 		lo_val = RREG32_PCIE(lo_base_addr);
 
-- 
2.20.1