mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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adc57834c9
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20454 3c298f89-4303-0410-b956-a3cf2f4a3e73
52 lines
1.8 KiB
Diff
52 lines
1.8 KiB
Diff
--- a/router/shared/linux_timer.c
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+++ b/router/shared/linux_timer.c
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@@ -94,6 +94,7 @@ typedef long uclock_t;
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#define TFLAG_NONE 0
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#define TFLAG_CANCELLED (1<<0)
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#define TFLAG_DELETED (1<<1)
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+#define TFLAG_QUEUED (1<<2)
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struct event {
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struct timeval it_interval;
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@@ -207,6 +208,7 @@ int timer_create(
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event_freelist = event->next;
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event->next = NULL;
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+ event->flags &= ~TFLAG_QUEUED;
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check_event_queue();
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@@ -387,6 +389,7 @@ int timer_settime
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}
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event->flags &= ~TFLAG_CANCELLED;
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+ event->flags |= TFLAG_QUEUED;
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unblock_timer();
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@@ -502,7 +505,15 @@ static void alarm_handler(int i)
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(*(event->func))((timer_t) event, (int)event->arg);
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/* If the event has been cancelled, do NOT put it back on the queue. */
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- if (!(event->flags & TFLAG_CANCELLED)) {
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+ /* Check for TFLAG_QUEUED is to avoid pathologic case, when after
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+ * dequeueing event handler deletes its own timer and allocates new one
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+ * which (at least in some cases) gets the same pointer and thus its
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+ * 'flags' will be rewritten, most notably TFLAG_CANCELLED, and, to
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+ * complete the disaster, it will be queued. alarm_handler tries to
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+ * enqueue 'event' (which is on the same memory position as newly
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+ * allocated timer), which results in queueing the same pointer once
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+ * more. And this way, loop in event queue is created. */
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+ if ( !(event->flags & TFLAG_CANCELLED) && !(event->flags & TFLAG_QUEUED) ) {
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/* if the event is a recurring event, reset the timer and
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* find its correct place in the sorted list of events.
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@@ -545,6 +556,7 @@ static void alarm_handler(int i)
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/* link our new event into the pending event queue. */
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event->next = *ppevent;
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*ppevent = event;
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+ event->flags |= TFLAG_QUEUED;
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} else {
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/* there is no interval, so recycle the event structure.
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* timer_delete((timer_t) event);
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