This is a note to let you know that I've just added the patch titled
drm/amdgpu: fix lost sync_to if scheduler is enabled.
to the 4.4-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-fix-lost-sync_to-if-scheduler-is-enabled.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 888c9e33e4c5a503285921046c621f7c73199d2f Mon Sep 17 00:00:00 2001
From: Chunming Zhou <David1.Zhou@xxxxxxx>
Date: Wed, 13 Jan 2016 12:55:18 +0800
Subject: drm/amdgpu: fix lost sync_to if scheduler is enabled.
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From: Chunming Zhou <David1.Zhou@xxxxxxx>
commit 888c9e33e4c5a503285921046c621f7c73199d2f upstream.
when scheduler is enabled, the semaphore isn't used at all.
Signed-off-by: Chunming Zhou <David1.Zhou@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -293,7 +293,8 @@ int amdgpu_sync_rings(struct amdgpu_sync
fence = to_amdgpu_fence(sync->sync_to[i]);
/* check if we really need to sync */
- if (!amdgpu_fence_need_sync(fence, ring))
+ if (!amdgpu_enable_scheduler &&
+ !amdgpu_fence_need_sync(fence, ring))
continue;
/* prevent GPU deadlocks */
@@ -303,7 +304,7 @@ int amdgpu_sync_rings(struct amdgpu_sync
}
if (amdgpu_enable_scheduler || !amdgpu_enable_semaphores) {
- r = fence_wait(&fence->base, true);
+ r = fence_wait(sync->sync_to[i], true);
if (r)
return r;
continue;
Patches currently in stable-queue which might be from David1.Zhou@xxxxxxx are
queue-4.4/drm-amdgpu-fix-lost-sync_to-if-scheduler-is-enabled.patch
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