FAILED: patch "[PATCH] xfs: fix a resource leak in xfs_alloc_buftarg()" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-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-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 29a7b2614357393b176ef06ba5bc3ff5afc8df69
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026050313-manmade-batting-5838@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 29a7b2614357393b176ef06ba5bc3ff5afc8df69 Mon Sep 17 00:00:00 2001
From: Haoxiang Li <[email protected]>
Date: Wed, 1 Apr 2026 12:02:41 +0800
Subject: [PATCH] xfs: fix a resource leak in xfs_alloc_buftarg()

In the error path, call fs_put_dax() to drop the DAX device reference.

index ee8c3944015a..580d40a5ee57 100644
@@ -1756,6 +1756,7 @@ xfs_alloc_buftarg(
 	return btp;
 
 error_free:
+	fs_put_dax(btp->bt_daxdev, mp);
 	kfree(btp);
 	return ERR_PTR(error);
 }

From: Haoxiang Li <[email protected]>

[ Upstream commit 29a7b2614357393b176ef06ba5bc3ff5afc8df69 ]

In the error path, call fs_put_dax() to drop the DAX device reference.

---
 fs/xfs/xfs_buf.c | 1 +
 1 file changed, 1 insertion(+)

index 20c1d146af1da..1181108f80746 100644
@@ -2045,6 +2045,7 @@ xfs_alloc_buftarg(
 error_lru:
 	list_lru_destroy(&btp->bt_lru);
 error_free:
+	fs_put_dax(btp->bt_daxdev, mp);
 	kmem_free(btp);
 	return NULL;
 }

2.53.0