knfsd: rename sk_defer_lock to sk_lock

Now that sk_defer_lock protects two different things, make the name more
generic.

Also don't bother with disabling _bh as the lock is only ever taken from
process context.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/sunrpc/svcsock.h

@@ -37,7 +37,8 @@ struct svc_sock {
 
 	atomic_t    	    	sk_reserved;	/* space on outq that is reserved */
 
-	spinlock_t		sk_defer_lock;	/* protects sk_deferred */
+	spinlock_t		sk_lock;	/* protects sk_deferred and
+						 * sk_info_authunix */
 	struct list_head	sk_deferred;	/* deferred requests that need to
 						 * be revisted */
 	struct mutex		sk_mutex;	/* to serialize sending data */

net/sunrpc/svcauth_unix.c

@@ -385,7 +385,7 @@ ip_map_cached_get(struct svc_rqst *rqstp)
 {
 	struct ip_map *ipm;
 	struct svc_sock *svsk = rqstp->rq_sock;
-	spin_lock_bh(&svsk->sk_defer_lock);
+	spin_lock(&svsk->sk_lock);
 	ipm = svsk->sk_info_authunix;
 	if (ipm != NULL) {
 		if (!cache_valid(&ipm->h)) {
@@ -395,13 +395,13 @@ ip_map_cached_get(struct svc_rqst *rqstp)
 			 * same IP address.
 			 */
 			svsk->sk_info_authunix = NULL;
-			spin_unlock_bh(&svsk->sk_defer_lock);
+			spin_unlock(&svsk->sk_lock);
 			cache_put(&ipm->h, &ip_map_cache);
 			return NULL;
 		}
 		cache_get(&ipm->h);
 	}
-	spin_unlock_bh(&svsk->sk_defer_lock);
+	spin_unlock(&svsk->sk_lock);
 	return ipm;
 }
 
@@ -410,14 +410,14 @@ ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
 {
 	struct svc_sock *svsk = rqstp->rq_sock;
 
-	spin_lock_bh(&svsk->sk_defer_lock);
+	spin_lock(&svsk->sk_lock);
 	if (svsk->sk_sock->type == SOCK_STREAM &&
 	    svsk->sk_info_authunix == NULL) {
 		/* newly cached, keep the reference */
 		svsk->sk_info_authunix = ipm;
 		ipm = NULL;
 	}
-	spin_unlock_bh(&svsk->sk_defer_lock);
+	spin_unlock(&svsk->sk_lock);
 	if (ipm)
 		cache_put(&ipm->h, &ip_map_cache);
 }

net/sunrpc/svcsock.c

@@ -53,7 +53,8 @@
  * 	svc_serv->sv_lock protects sv_tempsocks, sv_permsocks, sv_tmpcnt.
  *	when both need to be taken (rare), svc_serv->sv_lock is first.
  *	BKL protects svc_serv->sv_nrthread.
- *	svc_sock->sk_defer_lock protects the svc_sock->sk_deferred list
+ *	svc_sock->sk_lock protects the svc_sock->sk_deferred list
+ *             and the ->sk_info_authunix cache.
  *	svc_sock->sk_flags.SK_BUSY prevents a svc_sock being enqueued multiply.
  *
  *	Some flags can be set to certain values at any time
@@ -1633,7 +1634,7 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
 	svsk->sk_server = serv;
 	atomic_set(&svsk->sk_inuse, 1);
 	svsk->sk_lastrecv = get_seconds();
-	spin_lock_init(&svsk->sk_defer_lock);
+	spin_lock_init(&svsk->sk_lock);
 	INIT_LIST_HEAD(&svsk->sk_deferred);
 	INIT_LIST_HEAD(&svsk->sk_ready);
 	mutex_init(&svsk->sk_mutex);
@@ -1857,9 +1858,9 @@ static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
 	dprintk("revisit queued\n");
 	svsk = dr->svsk;
 	dr->svsk = NULL;
-	spin_lock_bh(&svsk->sk_defer_lock);
+	spin_lock(&svsk->sk_lock);
 	list_add(&dr->handle.recent, &svsk->sk_deferred);
-	spin_unlock_bh(&svsk->sk_defer_lock);
+	spin_unlock(&svsk->sk_lock);
 	set_bit(SK_DEFERRED, &svsk->sk_flags);
 	svc_sock_enqueue(svsk);
 	svc_sock_put(svsk);
@@ -1925,7 +1926,7 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk)
 
 	if (!test_bit(SK_DEFERRED, &svsk->sk_flags))
 		return NULL;
-	spin_lock_bh(&svsk->sk_defer_lock);
+	spin_lock(&svsk->sk_lock);
 	clear_bit(SK_DEFERRED, &svsk->sk_flags);
 	if (!list_empty(&svsk->sk_deferred)) {
 		dr = list_entry(svsk->sk_deferred.next,
@@ -1934,6 +1935,6 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk)
 		list_del_init(&dr->handle.recent);
 		set_bit(SK_DEFERRED, &svsk->sk_flags);
 	}
-	spin_unlock_bh(&svsk->sk_defer_lock);
+	spin_unlock(&svsk->sk_lock);
 	return dr;
 }