This is a note to let you know that I've just added the patch titled
drm/amdgpu: check before checking pci bridge registers
to the 4.2-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-amdgpu-check-before-checking-pci-bridge-registers.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e79d5c0870eedce94e5f5a2ffab30511e48fa144 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Tue, 6 Oct 2015 09:38:45 -0400
Subject: drm/amdgpu: check before checking pci bridge registers
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From: Alex Deucher <alexander.deucher@xxxxxxx>
commit e79d5c0870eedce94e5f5a2ffab30511e48fa144 upstream.
Make sure we are not the root device before attempting to
read the pcie bridge registers to check the pcie gen speeed.
Fixes a crash when the device is passed through to a VM.
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/cik.c | 3 +++
drivers/gpu/drm/amd/amdgpu/vi.c | 3 +++
2 files changed, 6 insertions(+)
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -1565,6 +1565,9 @@ static void cik_pcie_gen3_enable(struct
int ret, i;
u16 tmp16;
+ if (pci_is_root_bus(adev->pdev->bus))
+ return;
+
if (amdgpu_pcie_gen2 == 0)
return;
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -968,6 +968,9 @@ static void vi_pcie_gen3_enable(struct a
u32 mask;
int ret;
+ if (pci_is_root_bus(adev->pdev->bus))
+ return;
+
if (amdgpu_pcie_gen2 == 0)
return;
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-4.2/drm-amdgpu-keep-the-pflip-interrupts-always-enabled-v7.patch
queue-4.2/drm-amdgpu-fix-num_crtc-on-cz.patch
queue-4.2/drm-amdgpu-check-before-checking-pci-bridge-registers.patch
queue-4.2/drm-radeon-add-pm-sysfs-files-late.patch
queue-4.2/drm-amdgpu-add-pm-sysfs-files-late.patch
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