Patch "drm/nouveau/pmu: do not assume a PMU is present" has been added to the 4.3-stable tree

Patch "drm/nouveau/pmu: do not assume a PMU is present" has been added to the 4.3-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/nouveau/pmu: do not assume a PMU is present

to the 4.3-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-nouveau-pmu-do-not-assume-a-pmu-is-present.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 579b7c58215329803ce184704463de09f0f310ac Mon Sep 17 00:00:00 2001
From: Alexandre Courbot <acourbot@nvidia.com>
Date: Thu, 3 Sep 2015 17:39:52 +0900
Subject: drm/nouveau/pmu: do not assume a PMU is present

From: Alexandre Courbot <acourbot@nvidia.com>

commit 579b7c58215329803ce184704463de09f0f310ac upstream.

Some devices may not have a PMU. Avoid a NULL pointer dereference in
such cases by checking whether the pointer given to nvkm_pmu_pgob() is
valid.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c
@@ -28,7 +28,7 @@
 void
 nvkm_pmu_pgob(struct nvkm_pmu *pmu, bool enable)
 {
-	if (pmu->func->pgob)
+	if (pmu && pmu->func->pgob)
 		pmu->func->pgob(pmu, enable);
 }
 


Patches currently in stable-queue which might be from acourbot@nvidia.com are

queue-4.3/drm-nouveau-pmu-do-not-assume-a-pmu-is-present.patch