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virtio-net: drop config_mutex
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config_mutex served two purposes: prevent multiple concurrent config
change handlers, and synchronize access to config_enable flag.

Since commit dbf2576
    workqueue: make all workqueues non-reentrant
all workqueues are non-reentrant, and config_enable
is now gone.

Get rid of the unnecessary lock.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Michael S. Tsirkin authored and Rusty Russell committed Oct 14, 2014
1 parent 102a278 commit 080c637
Showing 1 changed file with 1 addition and 6 deletions.
7 changes: 1 addition & 6 deletions drivers/net/virtio_net.c
Original file line number Diff line number Diff line change
Expand Up @@ -132,9 +132,6 @@ struct virtnet_info {
/* Work struct for config space updates */
struct work_struct config_work;

/* Lock for config space updates */
struct mutex config_lock;

/* Does the affinity hint is set for virtqueues? */
bool affinity_hint_set;

Expand Down Expand Up @@ -1404,7 +1401,6 @@ static void virtnet_config_changed_work(struct work_struct *work)
container_of(work, struct virtnet_info, config_work);
u16 v;

mutex_lock(&vi->config_lock);
if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
struct virtio_net_config, status, &v) < 0)
goto done;
Expand All @@ -1430,7 +1426,7 @@ static void virtnet_config_changed_work(struct work_struct *work)
netif_tx_stop_all_queues(vi->dev);
}
done:
mutex_unlock(&vi->config_lock);
return;
}

static void virtnet_config_changed(struct virtio_device *vdev)
Expand Down Expand Up @@ -1751,7 +1747,6 @@ static int virtnet_probe(struct virtio_device *vdev)
u64_stats_init(&virtnet_stats->rx_syncp);
}

mutex_init(&vi->config_lock);
INIT_WORK(&vi->config_work, virtnet_config_changed_work);

/* If we can receive ANY GSO packets, we must allocate large ones. */
Expand Down

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