[PATCH 1/2] virtio-blk: Acquire context while switching them on dataplane start

[Sergio Lopez]

On dataplane start, acquire the new AIO context before calling
'blk_set_aio_context', releasing it immediately afterwards. This
prevents reaching the AIO context attach/detach notifier functions
without having acquired it first.

It was also the only place where 'blk_set_aio_context' was called with
an unprotected AIO context.

Signed-off-by: Sergio Lopez <s...@redhat.com>
---
 hw/block/dataplane/virtio-blk.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index 37499c5564..034e43cb1f 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -214,7 +214,9 @@ int virtio_blk_data_plane_start(VirtIODevice *vdev)
     vblk->dataplane_started = true;
     trace_virtio_blk_data_plane_start(s);
 
+    aio_context_acquire(s->ctx);
     r = blk_set_aio_context(s->conf->conf.blk, s->ctx, &local_err);
+    aio_context_release(s->ctx);
     if (r < 0) {
         error_report_err(local_err);
         goto fail_guest_notifiers;
-- 
2.26.2