SUNRPC: Enforce atomic updates of rpc_cred->cr_flags

Convert to the use of atomic bitops...

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 2156327da45b..4d7c78b05d1e 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -190,8 +190,8 @@ rpcauth_prune_expired(struct rpc_auth *auth, struct rpc_cred *cred, struct hlist
         if (atomic_read(&cred->cr_count) != 1)
                return;
         if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
-                cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
-        if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
+                clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+        if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) {
                 __hlist_del(&cred->cr_hash);
                 hlist_add_head(&cred->cr_hash, free);
         }
@@ -267,7 +267,7 @@ retry:
                 if (!IS_ERR(new))
                         goto retry;
                 cred = new;
-        } else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
+        } else if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)
                         && cred->cr_ops->cr_init != NULL
                         && !(flags & RPCAUTH_LOOKUP_NEW)) {
                 int res = cred->cr_ops->cr_init(auth, cred);
@@ -440,17 +440,19 @@ rpcauth_refreshcred(struct rpc_task *task)
 void
 rpcauth_invalcred(struct rpc_task *task)
 {
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
         dprintk("RPC: %5u invalidating %s cred %p\n",
-                task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
-        spin_lock(&rpc_credcache_lock);
-        if (task->tk_msg.rpc_cred)
-                task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
-        spin_unlock(&rpc_credcache_lock);
+                task->tk_pid, task->tk_auth->au_ops->au_name, cred);
+        if (cred)
+                clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
 }
 
 int
 rpcauth_uptodatecred(struct rpc_task *task)
 {
-        return !(task->tk_msg.rpc_cred) ||
-                (task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
+        struct rpc_cred *cred = task->tk_msg.rpc_cred;
+
+        return cred == NULL ||
+                test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0;
 }