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authorIngo Molnar <mingo@elte.hu>2008-07-27 23:15:26 +0200
committerIngo Molnar <mingo@elte.hu>2008-07-27 23:15:26 +0200
commit2106b531eaa2edd0c2dfa735a0556c08c7ba3c86 (patch)
tree423fcf0ac74f0dd5d88864b7bd99a1160129e064 /kernel
parente338125b8a886923ba8367207c144764dc352584 (diff)
parentba661292a2bc6ddd305a212b0526e5dc22195fe7 (diff)
Merge branch 'timers/urgent' of ssh://master.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip into timers/urgent
Diffstat (limited to 'kernel')
-rw-r--r--kernel/posix-timers.c19
-rw-r--r--kernel/signal.c1
2 files changed, 15 insertions, 5 deletions
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index dbd8398ddb0..0ffaeb075e3 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -289,21 +289,29 @@ void do_schedule_next_timer(struct siginfo *info)
else
schedule_next_timer(timr);
- info->si_overrun = timr->it_overrun_last;
+ info->si_overrun += timr->it_overrun_last;
}
if (timr)
unlock_timer(timr, flags);
}
-int posix_timer_event(struct k_itimer *timr,int si_private)
+int posix_timer_event(struct k_itimer *timr, int si_private)
{
- memset(&timr->sigq->info, 0, sizeof(siginfo_t));
+ /*
+ * FIXME: if ->sigq is queued we can race with
+ * dequeue_signal()->do_schedule_next_timer().
+ *
+ * If dequeue_signal() sees the "right" value of
+ * si_sys_private it calls do_schedule_next_timer().
+ * We re-queue ->sigq and drop ->it_lock().
+ * do_schedule_next_timer() locks the timer
+ * and re-schedules it while ->sigq is pending.
+ * Not really bad, but not that we want.
+ */
timr->sigq->info.si_sys_private = si_private;
- /* Send signal to the process that owns this timer.*/
timr->sigq->info.si_signo = timr->it_sigev_signo;
- timr->sigq->info.si_errno = 0;
timr->sigq->info.si_code = SI_TIMER;
timr->sigq->info.si_tid = timr->it_id;
timr->sigq->info.si_value = timr->it_sigev_value;
@@ -435,6 +443,7 @@ static struct k_itimer * alloc_posix_timer(void)
kmem_cache_free(posix_timers_cache, tmr);
tmr = NULL;
}
+ memset(&tmr->sigq->info, 0, sizeof(siginfo_t));
return tmr;
}
diff --git a/kernel/signal.c b/kernel/signal.c
index 6c0958e52ea..c5bf0c0df65 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1319,6 +1319,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
q->info.si_overrun++;
goto out;
}
+ q->info.si_overrun = 0;
signalfd_notify(t, sig);
pending = group ? &t->signal->shared_pending : &t->pending;