linux-kernel - [PATCH 5.18 044/102] NFS: restore module put when manager exits.

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Date:   Tue,  5 Jul 2022 13:58:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, NeilBrown <neilb@...e.de>,
        Anna Schumaker <Anna.Schumaker@...app.com>
Subject: [PATCH 5.18 044/102] NFS: restore module put when manager exits.

From: NeilBrown <neilb@...e.de>

commit 080abad71e99d2becf38c978572982130b927a28 upstream.

Commit f49169c97fce ("NFSD: Remove svc_serv_ops::svo_module") removed
calls to module_put_and_kthread_exit() from threads that acted as SUNRPC
servers and had a related svc_serv_ops structure.  This was correct.

It ALSO removed the module_put_and_kthread_exit() call from
nfs4_run_state_manager() which is NOT a SUNRPC service.

Consequently every time the NFSv4 state manager runs the module count
increments and won't be decremented.  So the nfsv4 module cannot be
unloaded.

So restore the module_put_and_kthread_exit() call.

Fixes: f49169c97fce ("NFSD: Remove svc_serv_ops::svo_module")
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/nfs/nfs4state.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -2743,5 +2743,6 @@ again:
 		goto again;

 	nfs_put_client(clp);
+	module_put_and_kthread_exit(0);
 	return 0;
 }