FAILED: patch "[PATCH] drm/vmwgfx: take fman->lock around fence list mutation in" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 250af2e8c3e90dc978e062a936b633870a22e660
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026080518-sauna-quickness-c58e@gregkh' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 250af2e8c3e90dc978e062a936b633870a22e660 Mon Sep 17 00:00:00 2001
From: Zack Rusin <[email protected]>
Date: Tue, 5 May 2026 18:22:25 -0400
Subject: [PATCH] drm/vmwgfx: take fman->lock around fence list mutation in
fifo_down

vmw_fence_fifo_down() drops fman->lock to wait on a fence and, on timeout, mutates fman->fence_list via list_del_init() and signals the fence without re-acquiring the lock. __vmw_fences_update() walks and removes entries from the same list under fman->lock from any other waiter, the fence-IRQ thread, or vmw_fences_update(), so the unlocked list_del_init() can corrupt the list head.

Re-take fman->lock before manipulating fence->head and use dma_fence_signal_locked(). Wrap the locked signalling in dma_fence_begin_signalling() / dma_fence_end_signalling() so the lockdep annotation that dma_fence_signal() previously provided is preserved (the same pattern as __vmw_fences_update()).

dma_fence_put() is moved outside the lock to avoid a recursive acquire from vmw_fence_obj_destroy(), which also takes fman->lock.

index 4ef84ff9b638..384c6736cf6b 100644
@@ -367,13 +367,24 @@ void vmw_fence_fifo_down(struct vmw_fence_manager *fman)
 		ret = vmw_fence_obj_wait(fence, false, false,
 					 VMW_FENCE_WAIT_TIMEOUT);
 
+		spin_lock(&fman->lock);
 		if (unlikely(ret != 0)) {
+			bool cookie = dma_fence_begin_signalling();
+
 			list_del_init(&fence->head);
-			dma_fence_signal(&fence->base);
+			if (fence->waiter_added) {
+				vmw_seqno_waiter_remove(fman->dev_priv);
+				fence->waiter_added = false;
+			}
+			dma_fence_signal_locked(&fence->base);
+			dma_fence_end_signalling(cookie);
 		}
 
 		BUG_ON(!list_empty(&fence->head));
+		spin_unlock(&fman->lock);
+
 		dma_fence_put(&fence->base);
+
 		spin_lock(&fman->lock);
 	}
 	spin_unlock(&fman->lock);