[PATCH 3/3] nfsd: fix management of listener transports

[Olga Kornievskaia <okorniev@redhat.com>]

When a particular listener is being removed we need to make sure
that we delete the entry from the list of permanent sockets
(sv_permsocks) as well as remove it from the listener transports
(sp_xprts). When adding back the leftover transports not being
removed we need to clear XPT_BUSY flag so that it can be used.

Fixes: 16a471177496 ("NFSD: add listener-{set,get} netlink command")
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
---
 fs/nfsd/nfsctl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 95ea4393305b..3deedd511e83 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1988,7 +1988,7 @@ int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info)
 	/* Close the remaining sockets on the permsocks list */
 	while (!list_empty(&permsocks)) {
 		xprt = list_first_entry(&permsocks, struct svc_xprt, xpt_list);
-		list_move(&xprt->xpt_list, &serv->sv_permsocks);
+		list_del_init(&xprt->xpt_list);
 
 		/*
 		 * Newly-created sockets are born with the BUSY bit set. Clear
@@ -2000,6 +2000,7 @@ int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info)
 
 		set_bit(XPT_CLOSE, &xprt->xpt_flags);
 		spin_unlock_bh(&serv->sv_lock);
+		svc_xprt_dequeue_entry(xprt);
 		svc_xprt_close(xprt);
 		spin_lock_bh(&serv->sv_lock);
 	}
@@ -2031,6 +2032,7 @@ int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info)
 
 		xprt = svc_find_listener(serv, xcl_name, net, sa);
 		if (xprt) {
+			clear_bit(XPT_BUSY, &xprt->xpt_flags);
 			svc_xprt_put(xprt);
 			continue;
 		}
-- 
2.47.1