This is a note to let you know that I've just added the patch titled
drm/msm: Fix potential Oops in a6xx_gmu_rpmh_init()
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-fix-potential-oops-in-a6xx_gmu_rpmh_init.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c2637abedb32972c3150c7cbb14c856e1b2a162c
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Mon Oct 4 16:45:30 2021 +0300
drm/msm: Fix potential Oops in a6xx_gmu_rpmh_init()
[ Upstream commit 3d91e50ff58364f6572ad268b508175d27800e51 ]
There are two problems here:
1) The "seqptr" is used uninitalized when we free it at the end.
2) The a6xx_gmu_get_mmio() function returns error pointers. It never
returns true.
Fixes: 64245fc55172 ("drm/msm/a6xx: use AOP-initialized PDC for a650")
Fixes: f8fc924e088e ("drm/msm/a6xx: Fix PDC register overlap")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211004134530.GB11689@kili
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index c95985792076f..f51d392d05d42 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -516,11 +516,11 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
struct platform_device *pdev = to_platform_device(gmu->dev);
void __iomem *pdcptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc");
- void __iomem *seqptr;
+ void __iomem *seqptr = NULL;
uint32_t pdc_address_offset;
bool pdc_in_aop = false;
- if (!pdcptr)
+ if (IS_ERR(pdcptr))
goto err;
if (adreno_is_a650(adreno_gpu) || adreno_is_a660(adreno_gpu))
@@ -532,7 +532,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
if (!pdc_in_aop) {
seqptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc_seq");
- if (!seqptr)
+ if (IS_ERR(seqptr))
goto err;
}
