My recent uhci cleanup series has introduced a regression, where qemu sometimes crashes on a device disconnect. The problem is that the uhci code never checked for a device not / no longer existing, instead it was relying on usb_handle_packet accepting a NULL device.
But since we now pass usb_handle_packet q->ep->dev, rather then just a local dev variable, we crash as q->ep == NULL due to the device no longer existing. This patch-set fixes this. Note that this patch-set also improves over the old behavior were we would: 1) create a queue for the device/ep 2) create an async for the packet 3) have usb_handle_packet fail 4) destroy the async 5) wait for the queue to be idle for 32 frames 6) destroy the queue Which was rather sub-optimal. Regards, Hans
