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monitor: do not use QTAILQ_FOREACH_SAFE across critical sections 

monitor_qmp_requests_pop_any_with_lock cannot modify the monitor list
concurrently with monitor_cleanup, since the dispatch bottom half
runs in the main thread, but anyway it is a bit ugly to keep
"next" live across critical sections of monitor_lock and Coverity
complains (CID 1397072).

Replace QTAILQ_FOREACH_SAFE with a while loop and QTAILQ_FIRST,
it is cleaner and more future-proof.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-12-28 14:40:41 +01:00
parent 1b9d35f33c
commit 82e870bac4
1 changed files with 2 additions and 3 deletions
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5
monitor.c
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@ -4617,8 +4617,6 @@ void monitor_init(Chardev *chr, int flags)
void monitor_cleanup(void)
{
Monitor *mon, *next;
/*
* We need to explicitly stop the I/O thread (but not destroy it),
* clean up the monitor resources, then destroy the I/O thread since
@ -4632,7 +4630,8 @@ void monitor_cleanup(void)
/* Flush output buffers and destroy monitors */
qemu_mutex_lock(&monitor_lock);
monitor_destroyed = true;
QTAILQ_FOREACH_SAFE(mon, &mon_list, entry, next) {
while (!QTAILQ_EMPTY(&mon_list)) {
Monitor *mon = QTAILQ_FIRST(&mon_list);
QTAILQ_REMOVE(&mon_list, mon, entry);
/* Permit QAPI event emission from character frontend release */
qemu_mutex_unlock(&monitor_lock);