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| author | Arnd Bergmann <arnd@relay.de.ibm.com> | 2010-03-09 19:24:45 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-08-22 01:27:36 +0200 |
| commit | 28457ee69c473a903e51e26c7bcd6f1e9eceb93e (patch) | |
| tree | 7f872922577ec45ce655d68770c95082ad858a45 /drivers/vhost/net.c | |
| parent | rcu: add comment stating that list_empty() applies to RCU-protected lists (diff) | |
| download | linux-28457ee69c473a903e51e26c7bcd6f1e9eceb93e.tar.xz linux-28457ee69c473a903e51e26c7bcd6f1e9eceb93e.zip | |
vhost: add __rcu annotations
Also add rcu_dereference_protected() for code paths where locks are held.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/net.c')
| -rw-r--r-- | drivers/vhost/net.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 29e850a7a2f9..1318ee008346 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -127,7 +127,10 @@ static void handle_tx(struct vhost_net *net) size_t len, total_len = 0; int err, wmem; size_t hdr_size; - struct socket *sock = rcu_dereference(vq->private_data); + struct socket *sock; + + sock = rcu_dereference_check(vq->private_data, + lockdep_is_held(&vq->mutex)); if (!sock) return; @@ -582,7 +585,10 @@ static void vhost_net_disable_vq(struct vhost_net *n, static void vhost_net_enable_vq(struct vhost_net *n, struct vhost_virtqueue *vq) { - struct socket *sock = vq->private_data; + struct socket *sock; + + sock = rcu_dereference_protected(vq->private_data, + lockdep_is_held(&vq->mutex)); if (!sock) return; if (vq == n->vqs + VHOST_NET_VQ_TX) { @@ -598,7 +604,8 @@ static struct socket *vhost_net_stop_vq(struct vhost_net *n, struct socket *sock; mutex_lock(&vq->mutex); - sock = vq->private_data; + sock = rcu_dereference_protected(vq->private_data, + lockdep_is_held(&vq->mutex)); vhost_net_disable_vq(n, vq); rcu_assign_pointer(vq->private_data, NULL); mutex_unlock(&vq->mutex); @@ -736,7 +743,8 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) } /* start polling new socket */ - oldsock = vq->private_data; + oldsock = rcu_dereference_protected(vq->private_data, + lockdep_is_held(&vq->mutex)); if (sock != oldsock) { vhost_net_disable_vq(n, vq); rcu_assign_pointer(vq->private_data, sock); |