Revision 8caf907f
| ID | 8caf907f07688972e5e7cd11526079b1665d6dba |
dataplane: Fix startup race.
Avoid trying to setup dataplane again if dataplane setup is already in
progress. This may happen if an eventfd is triggered during setup.
I saw this occasionally with an experimental s390 irqfd implementation:
virtio_blk_handle_output> virtio_blk_data_plane_start> virtio_ccw_set_host_notifier
...> virtio_queue_set_host_notifier_fd_handler> virtio_queue_host_notifier_read> virtio_queue_notify_vq> virtio_blk_handle_output> virtio_blk_data_plane_start> vring_setup> hostmem_init> memory_listener_register
-> BOOM
As virtio-ccw tries to follow what virtio-pci does, it might be triggerable
for other platforms as well.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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