Commit 0e7174b9 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin

virtio_console: break out of buf poll on remove

A common pattern for device reset is currently:
vdev->config->reset(vdev);
.. cleanup ..

reset prevents new interrupts from arriving and waits for interrupt
handlers to finish.

However if - as is common - the handler queues a work request which is
flushed during the cleanup stage, we have code adding buffers / trying
to get buffers while device is reset. Not good.

This was reproduced by running
	modprobe virtio_console
	modprobe -r virtio_console
in a loop.

Fix this up by calling virtio_break_device + flush before reset.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1786239Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent c46eccda
......@@ -1957,6 +1957,13 @@ static void virtcons_remove(struct virtio_device *vdev)
list_del(&portdev->list);
spin_unlock_irq(&pdrvdata_lock);
/* Device is going away, exit any polling for buffers */
virtio_break_device(vdev);
if (use_multiport(portdev))
flush_work(&portdev->control_work);
else
flush_work(&portdev->config_work);
/* Disable interrupts for vqs */
virtio_reset_device(vdev);
/* Finish up work that's lined up */
......
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