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drm/amdgpu: grab an additional reference on the gang fence v2

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We keep the gang submission fence around in adev, make sure that it
stays alive.

v2: fix memory leak on retry

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König
2025-01-14 13:51:39 +01:00
committed by Alex Deucher
parent 6c11d4a87d
commit 0d9a95099d
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -6913,18 +6913,26 @@ struct dma_fence *amdgpu_device_switch_gang(struct amdgpu_device *adev,
{
struct dma_fence *old = NULL;
dma_fence_get(gang);
do {
dma_fence_put(old);
old = amdgpu_device_get_gang(adev);
if (old == gang)
break;
if (!dma_fence_is_signaled(old))
if (!dma_fence_is_signaled(old)) {
dma_fence_put(gang);
return old;
}
} while (cmpxchg((struct dma_fence __force **)&adev->gang_submit,
old, gang) != old);
/*
* Drop it once for the exchanged reference in adev and once for the
* thread local reference acquired in amdgpu_device_get_gang().
*/
dma_fence_put(old);
dma_fence_put(old);
return NULL;
}