netdev - [PATCH net-next v8 2/7] net: vhost: replace magic number of lock annotation

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Date:   Sun, 19 Aug 2018 05:11:21 -0700
From:   xiangxia.m.yue@...il.com
To:     jasowang@...hat.com, mst@...hat.com, makita.toshiaki@....ntt.co.jp
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Tonghao Zhang <xiangxia.m.yue@...il.com>
Subject: [PATCH net-next v8 2/7] net: vhost: replace magic number of lock annotation

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

Use the VHOST_NET_VQ_XXX as a subclass for mutex_lock_nested.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
Acked-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vhost/net.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 367d802..32c1b52 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -712,7 +712,7 @@ static void handle_tx(struct vhost_net *net)
 	struct vhost_virtqueue *vq = &nvq->vq;
 	struct socket *sock;
 
-	mutex_lock(&vq->mutex);
+	mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_TX);
 	sock = vq->private_data;
 	if (!sock)
 		goto out;
@@ -777,7 +777,7 @@ static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk,
 		/* Flush batched heads first */
 		vhost_net_signal_used(rnvq);
 		/* Both tx vq and rx socket were polled here */
-		mutex_lock_nested(&tvq->mutex, 1);
+		mutex_lock_nested(&tvq->mutex, VHOST_NET_VQ_TX);
 		vhost_disable_notify(&net->dev, tvq);
 
 		preempt_disable();
@@ -919,7 +919,7 @@ static void handle_rx(struct vhost_net *net)
 	__virtio16 num_buffers;
 	int recv_pkts = 0;
 
-	mutex_lock_nested(&vq->mutex, 0);
+	mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_RX);
 	sock = vq->private_data;
 	if (!sock)
 		goto out;
-- 
1.8.3.1