FAILED: patch "[PATCH] btrfs: reset fs_root to NULL on error in open_ctree" failed to apply to 4.4-stable tree

The patch below does not apply to the 4.4-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 315bf8ef914f31d51d084af950703aa1e09a728c Mon Sep 17 00:00:00 2001
From: Josef Bacik <[email protected]>
Date: Thu, 13 Feb 2020 10:47:28 -0500
Subject: [PATCH] btrfs: reset fs_root to NULL on error in open_ctree

While running my error injection script I hit a panic when we tried to clean up the fs_root when freeing the fs_root. This is because fs_info->fs_root == PTR_ERR(-EIO), which isn't great. Fix this by setting fs_info->fs_root = NULL; if we fail to read the root.

index d7fec89974cb..197352f23534 100644
@@ -3200,6 +3200,7 @@ int __cold open_ctree(struct super_block *sb,
 	if (IS_ERR(fs_info->fs_root)) {
 		err = PTR_ERR(fs_info->fs_root);
 		btrfs_warn(fs_info, "failed to read fs tree: %d", err);
+		fs_info->fs_root = NULL;
 		goto fail_qgroup;
 	}