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| author | Michael S. Tsirkin <mst@redhat.com> | 2011-01-18 13:04:43 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2011-02-01 16:48:46 +0200 |
| commit | 5e18247b02d60a1ea4bf98c05e139461ca9aec64 (patch) | |
| tree | ccb92d5f599413e138fd148594c04d9f3aa43701 | |
| parent | fca540ab5f4718c6133f71f7be1793066008bf89 (diff) | |
| download | linux-5e18247b02d60a1ea4bf98c05e139461ca9aec64.tar.gz linux-5e18247b02d60a1ea4bf98c05e139461ca9aec64.tar.bz2 linux-5e18247b02d60a1ea4bf98c05e139461ca9aec64.zip | |
vhost: rcu annotation fixup
When built with rcu checks enabled, vhost triggers
bogus warnings as vhost features are read without
dev->mutex sometimes, and private pointer is read
with our kind of rcu where work serves as a
read side critical section.
Fixing it properly is not trivial.
Disable the warnings by stubbing out the checks for now.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | drivers/vhost/net.c | 9 | ||||
| -rw-r--r-- | drivers/vhost/vhost.h | 6 |
2 files changed, 8 insertions, 7 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 9b3ca103135f..f616cefc95ba 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -128,8 +128,7 @@ static void handle_tx(struct vhost_net *net) size_t hdr_size; struct socket *sock; - /* TODO: check that we are running from vhost_worker? - * Not sure it's worth it, it's straight-forward enough. */ + /* TODO: check that we are running from vhost_worker? */ sock = rcu_dereference_check(vq->private_data, 1); if (!sock) return; @@ -306,7 +305,8 @@ static void handle_rx_big(struct vhost_net *net) size_t len, total_len = 0; int err; size_t hdr_size; - struct socket *sock = rcu_dereference(vq->private_data); + /* TODO: check that we are running from vhost_worker? */ + struct socket *sock = rcu_dereference_check(vq->private_data, 1); if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue)) return; @@ -415,7 +415,8 @@ static void handle_rx_mergeable(struct vhost_net *net) int err, headcount; size_t vhost_hlen, sock_hlen; size_t vhost_len, sock_len; - struct socket *sock = rcu_dereference(vq->private_data); + /* TODO: check that we are running from vhost_worker? */ + struct socket *sock = rcu_dereference_check(vq->private_data, 1); if (!sock || skb_queue_empty(&sock->sk->sk_receive_queue)) return; diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 2af44b7b1f3f..b3363ae38518 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -173,9 +173,9 @@ static inline int vhost_has_feature(struct vhost_dev *dev, int bit) { unsigned acked_features; - acked_features = - rcu_dereference_index_check(dev->acked_features, - lockdep_is_held(&dev->mutex)); + /* TODO: check that we are running from vhost_worker or dev mutex is + * held? */ + acked_features = rcu_dereference_index_check(dev->acked_features, 1); return acked_features & (1 << bit); } |