[PATCH] fs: nfs: sysfs: Switch to kvfree_rcu() API

["Uladzislau Rezki (Sony)" <urezki@gmail.com>]

From: Uladzislau Rezki <uladzislau.rezki@sony.com>

Instead of invoking a synchronize_rcu() to free a pointer
after a grace period we can directly make use of new API
that does the same but in more efficient way.

TO: Trond Myklebust <trond.myklebust@hammerspace.com>
TO: linux-nfs@vger.kernel.org
Signed-off-by: Uladzislau Rezki <uladzislau.rezki@sony.com>
---
 fs/nfs/sysfs.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c
index 8cb70755e3c9..ff88d5d58e1e 100644
--- a/fs/nfs/sysfs.c
+++ b/fs/nfs/sysfs.c
@@ -113,10 +113,9 @@ static ssize_t nfs_netns_identifier_store(struct kobject *kobj,
 	if (!p)
 		return -ENOMEM;
 	old = rcu_dereference_protected(xchg(&c->identifier, (char __rcu *)p), 1);
-	if (old) {
-		synchronize_rcu();
-		kfree(old);
-	}
+	if (old)
+		kvfree_rcu(old);
+
 	return count;
 }
 
-- 
2.30.2