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xen-netfront: don't nest queue locks in xennet_connect() 

The nesting of the per-queue rx_lock and tx_lock in xennet_connect()
is confusing to both humans and lockdep.  The locking is safe because
this is the only place where the locks are nested in this way but
lockdep still warns.

Instead of adding the missing lockdep annotations, refactor the
locking to avoid the confusing nesting.  This is still safe, because
the xenbus connection state changes are all serialized by the xenwatch
thread.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Vrabel 2014-07-02 16:09:14 +01:00 committed by David S. Miller
parent 6e08d5e3c8
commit f50b407653
1 changed files with 12 additions and 4 deletions
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16
drivers/net/xen-netfront.c
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@ -2046,13 +2046,15 @@ static int xennet_connect(struct net_device *dev)
/* By now, the queue structures have been set up */
for (j = 0; j < num_queues; ++j) {
queue = &np->queues[j];
spin_lock_bh(&queue->rx_lock);
spin_lock_irq(&queue->tx_lock);
/* Step 1: Discard all pending TX packet fragments. */
spin_lock_irq(&queue->tx_lock);
xennet_release_tx_bufs(queue);
spin_unlock_irq(&queue->tx_lock);
/* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
spin_lock_bh(&queue->rx_lock);
for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
skb_frag_t *frag;
const struct page *page;
@ -2076,6 +2078,8 @@ static int xennet_connect(struct net_device *dev)
}
queue->rx.req_prod_pvt = requeue_idx;
spin_unlock_bh(&queue->rx_lock);
}
/*
@ -2087,13 +2091,17 @@ static int xennet_connect(struct net_device *dev)
netif_carrier_on(np->netdev);
for (j = 0; j < num_queues; ++j) {
queue = &np->queues[j];
notify_remote_via_irq(queue->tx_irq);
if (queue->tx_irq != queue->rx_irq)
notify_remote_via_irq(queue->rx_irq);
xennet_tx_buf_gc(queue);
xennet_alloc_rx_buffers(queue);
spin_lock_irq(&queue->tx_lock);
xennet_tx_buf_gc(queue);
spin_unlock_irq(&queue->tx_lock);
spin_lock_bh(&queue->rx_lock);
xennet_alloc_rx_buffers(queue);
spin_unlock_bh(&queue->rx_lock);
}