[PATCH] NFSD: Fix misuse of rcu_assign_pointer

[Chuck Lever <chuck.lever@xxxxxxxxxx>]

To address this error:

  CC [M]  fs/nfsd/filecache.o
  CHECK   /home/cel/src/linux/linux/fs/nfsd/filecache.c
/home/cel/src/linux/linux/fs/nfsd/filecache.c:772:9: error: incompatible types in comparison expression (different address spaces):
/home/cel/src/linux/linux/fs/nfsd/filecache.c:772:9:    struct net [noderef] __rcu *
/home/cel/src/linux/linux/fs/nfsd/filecache.c:772:9:    struct net *

The "net" field in struct nfsd_fcache_disposal is not annotated as
requiring an RCU assignment.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 fs/nfsd/filecache.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index fdf89fcf1a0c..3fa172f86441 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -772,7 +772,7 @@ nfsd_alloc_fcache_disposal(struct net *net)
 static void
 nfsd_free_fcache_disposal(struct nfsd_fcache_disposal *l)
 {
-	rcu_assign_pointer(l->net, NULL);
+	l->net = NULL;
 	cancel_work_sync(&l->work);
 	nfsd_file_dispose_list(&l->freeme);
 	kfree_rcu(l, rcu);