5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: NeilBrown <neilb@xxxxxxx>
[ Upstream commit 865b674069e05e5779fcf8cf7a166d2acb7e930b ]
There is some cleanup that is duplicated in lockd_down() and the failure
path of lockd_up().
Factor these out into a new lockd_put() and call it from both places.
lockd_put() does *not* take the mutex - that must be held by the caller.
It decrements nlmsvc_users and if that reaches zero, it cleans up.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/lockd/svc.c | 64 +++++++++++++++++++++-----------------------------
1 file changed, 27 insertions(+), 37 deletions(-)
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 9aa499a761591..7f12c280fd30d 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -351,14 +351,6 @@ static struct notifier_block lockd_inet6addr_notifier = {
};
#endif
-static void lockd_unregister_notifiers(void)
-{
- unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
-#if IS_ENABLED(CONFIG_IPV6)
- unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
-#endif
-}
-
static int lockd_start_svc(struct svc_serv *serv)
{
int error;
@@ -450,6 +442,27 @@ static int lockd_create_svc(void)
return 0;
}
+static void lockd_put(void)
+{
+ if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
+ return;
+ if (--nlmsvc_users)
+ return;
+
+ unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
+#if IS_ENABLED(CONFIG_IPV6)
+ unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
+#endif
+
+ if (nlmsvc_task) {
+ kthread_stop(nlmsvc_task);
+ dprintk("lockd_down: service stopped\n");
+ nlmsvc_task = NULL;
+ }
+ nlmsvc_serv = NULL;
+ dprintk("lockd_down: service destroyed\n");
+}
+
/*
* Bring up the lockd process if it's not already up.
*/
@@ -461,21 +474,16 @@ int lockd_up(struct net *net, const struct cred *cred)
error = lockd_create_svc();
if (error)
- goto err_create;
+ goto err;
+ nlmsvc_users++;
error = lockd_up_net(nlmsvc_serv, net, cred);
if (error < 0) {
- goto err_put;
+ lockd_put();
+ goto err;
}
- nlmsvc_users++;
-err_put:
- if (nlmsvc_users == 0) {
- lockd_unregister_notifiers();
- kthread_stop(nlmsvc_task);
- nlmsvc_serv = NULL;
- }
-err_create:
+err:
mutex_unlock(&nlmsvc_mutex);
return error;
}
@@ -489,25 +497,7 @@ lockd_down(struct net *net)
{
mutex_lock(&nlmsvc_mutex);
lockd_down_net(nlmsvc_serv, net);
- if (nlmsvc_users) {
- if (--nlmsvc_users)
- goto out;
- } else {
- printk(KERN_ERR "lockd_down: no users! task=%p\n",
- nlmsvc_task);
- BUG();
- }
-
- if (!nlmsvc_task) {
- printk(KERN_ERR "lockd_down: no lockd running.\n");
- BUG();
- }
- lockd_unregister_notifiers();
- kthread_stop(nlmsvc_task);
- dprintk("lockd_down: service destroyed\n");
- nlmsvc_serv = NULL;
- nlmsvc_task = NULL;
-out:
+ lockd_put();
mutex_unlock(&nlmsvc_mutex);
}
EXPORT_SYMBOL_GPL(lockd_down);
--
2.43.0
