[PATCH 18/19] nfsd: move nfsd_debugfs_init() after nfsd4_init_slabs() in init_nfsd()

nfsd_debugfs_init() runs before nfsd4_init_slabs() in init_nfsd().
If the slab allocation fails, the bare "return retval" bypasses
nfsd_debugfs_exit(), leaving orphan debugfs files with stale fops
pointers into the freed module text.

Move nfsd_debugfs_init() to after the slab init succeeds, so the
early return has no debugfs state to clean up.

Fixes: 9fe5ea760e64 ("NFSD: Add /sys/kernel/debug/nfsd")
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Jeff Layton <[email protected]>
---
 fs/nfsd/nfsctl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index f3b3154b16c5..b69e5f686e9d 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -2557,11 +2557,12 @@ static int __init init_nfsd(void)
 {
 	int retval;
 
-	nfsd_debugfs_init();
-
 	retval = nfsd4_init_slabs();
 	if (retval)
 		return retval;
+
+	nfsd_debugfs_init();
+
 	retval = nfsd4_init_pnfs();
 	if (retval)
 		goto out_free_slabs;

-- 
2.54.0