blk_dev_change_media_cb() is called for all potential tray movements; however, it is possible to request closing the tray but nothing actually happening (on a floppy disk drive without a medium).
Thus, the actual tray status should be inquired before sending a tray-moved event (and an event should be sent whenever the status changed). Checking @load is now superfluous; it was necessary because it was possible to change a medium without having explicitly opened the tray and closed it again (or it might have been possible, at least). This is no longer possible, though. Signed-off-by: Max Reitz <mre...@redhat.com> Reviewed-by: Eric Blake <ebl...@redhat.com> --- block/block-backend.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/block/block-backend.c b/block/block-backend.c index eb7409c..10e4d71 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -429,18 +429,15 @@ void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void blk_dev_change_media_cb(BlockBackend *blk, bool load) { if (blk->dev_ops && blk->dev_ops->change_media_cb) { - bool tray_was_closed = !blk_dev_is_tray_open(blk); + bool tray_was_open, tray_is_open; + tray_was_open = blk_dev_is_tray_open(blk); blk->dev_ops->change_media_cb(blk->dev_opaque, load); - if (tray_was_closed) { - /* tray open */ - qapi_event_send_device_tray_moved(blk_name(blk), - true, &error_abort); - } - if (load) { - /* tray close */ - qapi_event_send_device_tray_moved(blk_name(blk), - false, &error_abort); + tray_is_open = blk_dev_is_tray_open(blk); + + if (tray_was_open != tray_is_open) { + qapi_event_send_device_tray_moved(blk_name(blk), tray_is_open, + &error_abort); } } } -- 2.6.1