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virtio: console: add locks around buffer removal in port unplug path 

The removal functions act on the vqs, and the vq operations need to be
locked.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2013-07-29 14:23:46 +09:30 committed by Rusty Russell
parent 927cfb9788
commit c6017e793b
1 changed files with 6 additions and 2 deletions
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8
drivers/char/virtio_console.c
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@ -1513,18 +1513,22 @@ static void remove_port_data(struct port *port)
{
struct port_buffer *buf;
spin_lock_irq(&port->inbuf_lock);
/* Remove unused data this port might have received. */
discard_port_data(port);
reclaim_consumed_buffers(port);
/* Remove buffers we queued up for the Host to send us data in. */
while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
free_buf(buf, true);
spin_unlock_irq(&port->inbuf_lock);
spin_lock_irq(&port->outvq_lock);
reclaim_consumed_buffers(port);
/* Free pending buffers from the out-queue. */
while ((buf = virtqueue_detach_unused_buf(port->out_vq)))
free_buf(buf, true);
spin_unlock_irq(&port->outvq_lock);
}
/*