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vsock/virtio: stop workers during the .remove()

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[ Upstream commit 17dd136738 ]

Before to call vdev->config->reset(vdev) we need to be sure that
no one is accessing the device, for this reason, we add new variables
in the struct virtio_vsock to stop the workers during the .remove().

This patch also add few comments before vdev->config->reset(vdev)
and vdev->config->del_vqs(vdev).

Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stefano Garzarella 2019-07-05 13:04:53 +02:00 committed by Greg Kroah-Hartman
parent 2404380b95
commit b40b29b615
1 changed files with 50 additions and 1 deletions
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51
net/vmw_vsock/virtio_transport.c
View file

@ -39,6 +39,7 @@ struct virtio_vsock {
* must be accessed with tx_lock held.
*/
struct mutex tx_lock;
bool tx_run;
struct work_struct send_pkt_work;
spinlock_t send_pkt_list_lock;
@ -54,6 +55,7 @@ struct virtio_vsock {
* must be accessed with rx_lock held.
*/
struct mutex rx_lock;
bool rx_run;
int rx_buf_nr;
int rx_buf_max_nr;
@ -61,6 +63,7 @@ struct virtio_vsock {
* vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held.
*/
struct mutex event_lock;
bool event_run;
struct virtio_vsock_event event_list[8];
u32 guest_cid;
@ -95,6 +98,10 @@ static void virtio_transport_loopback_work(struct work_struct *work)
spin_unlock_bh(&vsock->loopback_list_lock);
mutex_lock(&vsock->rx_lock);
if (!vsock->rx_run)
goto out;
while (!list_empty(&pkts)) {
struct virtio_vsock_pkt *pkt;
@ -103,6 +110,7 @@ static void virtio_transport_loopback_work(struct work_struct *work)
virtio_transport_recv_pkt(pkt);
}
out:
mutex_unlock(&vsock->rx_lock);
}
@ -131,6 +139,9 @@ virtio_transport_send_pkt_work(struct work_struct *work)
mutex_lock(&vsock->tx_lock);
if (!vsock->tx_run)
goto out;
vq = vsock->vqs[VSOCK_VQ_TX];
for (;;) {
@ -189,6 +200,7 @@ virtio_transport_send_pkt_work(struct work_struct *work)
if (added)
virtqueue_kick(vq);
out:
mutex_unlock(&vsock->tx_lock);
if (restart_rx)
@ -324,6 +336,10 @@ static void virtio_transport_tx_work(struct work_struct *work)
vq = vsock->vqs[VSOCK_VQ_TX];
mutex_lock(&vsock->tx_lock);
if (!vsock->tx_run)
goto out;
do {
struct virtio_vsock_pkt *pkt;
unsigned int len;
@ -334,6 +350,8 @@ static void virtio_transport_tx_work(struct work_struct *work)
added = true;
}
} while (!virtqueue_enable_cb(vq));
out:
mutex_unlock(&vsock->tx_lock);
if (added)
@ -362,6 +380,9 @@ static void virtio_transport_rx_work(struct work_struct *work)
mutex_lock(&vsock->rx_lock);
if (!vsock->rx_run)
goto out;
do {
virtqueue_disable_cb(vq);
for (;;) {
@ -471,6 +492,9 @@ static void virtio_transport_event_work(struct work_struct *work)
mutex_lock(&vsock->event_lock);
if (!vsock->event_run)
goto out;
do {
struct virtio_vsock_event *event;
unsigned int len;
@ -485,7 +509,7 @@ static void virtio_transport_event_work(struct work_struct *work)
} while (!virtqueue_enable_cb(vq));
virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
out:
mutex_unlock(&vsock->event_lock);
}
@ -621,12 +645,18 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work);
INIT_WORK(&vsock->loopback_work, virtio_transport_loopback_work);
mutex_lock(&vsock->tx_lock);
vsock->tx_run = true;
mutex_unlock(&vsock->tx_lock);
mutex_lock(&vsock->rx_lock);
virtio_vsock_rx_fill(vsock);
vsock->rx_run = true;
mutex_unlock(&vsock->rx_lock);
mutex_lock(&vsock->event_lock);
virtio_vsock_event_fill(vsock);
vsock->event_run = true;
mutex_unlock(&vsock->event_lock);
vdev->priv = vsock;
@ -661,6 +691,24 @@ static void virtio_vsock_remove(struct virtio_device *vdev)
/* Reset all connected sockets when the device disappear */
vsock_for_each_connected_socket(virtio_vsock_reset_sock);
/* Stop all work handlers to make sure no one is accessing the device,
* so we can safely call vdev->config->reset().
*/
mutex_lock(&vsock->rx_lock);
vsock->rx_run = false;
mutex_unlock(&vsock->rx_lock);
mutex_lock(&vsock->tx_lock);
vsock->tx_run = false;
mutex_unlock(&vsock->tx_lock);
mutex_lock(&vsock->event_lock);
vsock->event_run = false;
mutex_unlock(&vsock->event_lock);
/* Flush all device writes and interrupts, device will not use any
* more buffers.
*/
vdev->config->reset(vdev);
mutex_lock(&vsock->rx_lock);
@ -691,6 +739,7 @@ static void virtio_vsock_remove(struct virtio_device *vdev)
}
spin_unlock_bh(&vsock->loopback_list_lock);
/* Delete virtqueues and flush outstanding callbacks if any */
vdev->config->del_vqs(vdev);
mutex_unlock(&the_virtio_vsock_mutex);