Patch "drm/amdgpu: Reserve fences for VM update" has been added to the 6.1-stable tree

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

    drm/amdgpu: Reserve fences for VM update

to the 6.1-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-reserve-fences-for-vm-update.patch
and it can be found in the queue-6.1 subdirectory.

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



commit b12c1dc583df742183c645e062fb5aeb52b46dc1
Author: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Date:   Mon Jul 17 15:28:52 2023 -0400

    drm/amdgpu: Reserve fences for VM update
    
    [ Upstream commit 316baf09d355aec1179981b6dfe28eba50c5ee5b ]
    
    In amdgpu_dma_buf_move_notify reserve fences for the page table updates
    in amdgpu_vm_clear_freed and amdgpu_vm_handle_moved. This fixes a BUG_ON
    in dma_resv_add_fence when using SDMA for page table updates.
    
    Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
    Reviewed-by: Christian König <christian.koenig@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index 7bd8e33b14be5..e8b3e9520cf6e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -400,7 +400,10 @@ amdgpu_dma_buf_move_notify(struct dma_buf_attachment *attach)
 				continue;
 		}
 
-		r = amdgpu_vm_clear_freed(adev, vm, NULL);
+		/* Reserve fences for two SDMA page table updates */
+		r = dma_resv_reserve_fences(resv, 2);
+		if (!r)
+			r = amdgpu_vm_clear_freed(adev, vm, NULL);
 		if (!r)
 			r = amdgpu_vm_handle_moved(adev, vm);
 



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