diff options
| -rw-r--r-- | monitor/qmp.c | 40 |
1 files changed, 22 insertions, 18 deletions
diff --git a/monitor/qmp.c b/monitor/qmp.c index 2b0308f933..092c527b6f 100644 --- a/monitor/qmp.c +++ b/monitor/qmp.c @@ -257,24 +257,6 @@ void coroutine_fn monitor_qmp_dispatcher_co(void *data) trace_monitor_qmp_in_band_dequeue(req_obj, req_obj->mon->qmp_requests->length); - if (qatomic_xchg(&qmp_dispatcher_co_busy, true) == true) { - /* - * Someone rescheduled us (probably because a new requests - * came in), but we didn't actually yield. Do that now, - * only to be immediately reentered and removed from the - * list of scheduled coroutines. - */ - qemu_coroutine_yield(); - } - - /* - * Move the coroutine from iohandler_ctx to qemu_aio_context for - * executing the command handler so that it can make progress if it - * involves an AIO_WAIT_WHILE(). - */ - aio_co_schedule(qemu_get_aio_context(), qmp_dispatcher_co); - qemu_coroutine_yield(); - /* * @req_obj has a request, we hold req_obj->mon->qmp_queue_lock */ @@ -298,8 +280,30 @@ void coroutine_fn monitor_qmp_dispatcher_co(void *data) monitor_resume(&mon->common); } + /* + * Drop the queue mutex now, before yielding, otherwise we might + * deadlock if the main thread tries to lock it. + */ qemu_mutex_unlock(&mon->qmp_queue_lock); + if (qatomic_xchg(&qmp_dispatcher_co_busy, true) == true) { + /* + * Someone rescheduled us (probably because a new requests + * came in), but we didn't actually yield. Do that now, + * only to be immediately reentered and removed from the + * list of scheduled coroutines. + */ + qemu_coroutine_yield(); + } + + /* + * Move the coroutine from iohandler_ctx to qemu_aio_context for + * executing the command handler so that it can make progress if it + * involves an AIO_WAIT_WHILE(). + */ + aio_co_schedule(qemu_get_aio_context(), qmp_dispatcher_co); + qemu_coroutine_yield(); + /* Process request */ if (req_obj->req) { if (trace_event_get_state(TRACE_MONITOR_QMP_CMD_IN_BAND)) { |