FAILED: patch "[PATCH] io_uring: get an active ref_node from files_data" failed to apply to 5.9-stable tree

The patch below does not apply to the 5.9-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]>.

thanks,

greg k-h

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

From 1e5d770bb8a23dd01e28e92f4fb0b1093c8bdbe6 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <[email protected]>
Date: Wed, 18 Nov 2020 14:56:25 +0000
Subject: [PATCH] io_uring: get an active ref_node from files_data

An active ref_node always can be found in ctx->files_data, it's much safer to get it this way instead of poking into files_data->ref_list.

index b205c1df3f74..5cb194ca4fce 100644
@@ -6974,9 +6974,7 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
 		return -ENXIO;
 
 	spin_lock(&data->lock);
-	if (!list_empty(&data->ref_list))
-		ref_node = list_first_entry(&data->ref_list,
-				struct fixed_file_ref_node, node);
+	ref_node = data->node;
 	spin_unlock(&data->lock);
 	if (ref_node)
 		percpu_ref_kill(&ref_node->refs);