[PATCH AUTOSEL 5.15 02/24] drm/msm/a6xx: Fix uinitialized use of gpu_scid

Sasha Levin
2021-12-06T21:12:57Z

From: Akhil P Oommen <akhilpo@codeaurora.org>

[ Upstream commit 9ba873e66ed317a1ff645d5e52c2e72597ff3d18 ]

Avoid a possible uninitialized use of gpu_scid variable to fix the
below smatch warning:
drivers/gpu/drm/msm/adreno/a6xx_gpu.c:1480 a6xx_llc_activate()
error: uninitialized symbol 'gpu_scid'.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>
Link: https://lore.kernel.org/r/20211118154903.3.Ie4ac321feb10168af569d9c2b4cf6828bed8122c@changeid
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 267a880811d65..723074aae5b63 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1424,17 +1424,24 @@ static void a6xx_llc_activate(struct a6xx_gpu *a6xx_gpu)
{
struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
struct msm_gpu *gpu = &adreno_gpu->base;
- u32 gpu_scid, cntl1_regval = 0;
+ u32 cntl1_regval = 0;

if (IS_ERR(a6xx_gpu->llc_mmio))
return;

if (!llcc_slice_activate(a6xx_gpu->llc_slice)) {
- gpu_scid = llcc_get_slice_id(a6xx_gpu->llc_slice);
+ u32 gpu_scid = llcc_get_slice_id(a6xx_gpu->llc_slice);

gpu_scid &= 0x1f;
cntl1_regval = (gpu_scid << 0) | (gpu_scid << 5) | (gpu_scid << 10) |
(gpu_scid << 15) | (gpu_scid << 20);
+
+ /* On A660, the SCID programming for UCHE traffic is done in
+ * A6XX_GBIF_SCACHE_CNTL0[14:10]
+ */
+ if (adreno_is_a660_family(adreno_gpu))
+ gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL0, (0x1f << 10) |
+ (1 << 8), (gpu_scid << 10) | (1 << 8));
}

/*
@@ -1471,13 +1478,6 @@ static void a6xx_llc_activate(struct a6xx_gpu *a6xx_gpu)
}

gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL1, GENMASK(24, 0), cntl1_regval);
-
- /* On A660, the SCID programming for UCHE traffic is done in
- * A6XX_GBIF_SCACHE_CNTL0[14:10]
- */
- if (adreno_is_a660_family(adreno_gpu))
- gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL0, (0x1f << 10) |
- (1 << 8), (gpu_scid << 10) | (1 << 8));
}

static void a6xx_llc_slices_destroy(struct a6xx_gpu *a6xx_gpu)
--
2.33.0