dl_task_timer() may fire on a different rq from where a task was removed
after throttling. Since the call path is:
dl_task_timer() ->
enqueue_task_dl() ->
enqueue_dl_entity() ->
replenish_dl_entity()
and replenish_dl_entity() uses dl_se's rq, we can't use current's rq
in dl_task_timer(), but we need to lock the task's previous one.
Signed-off-by: Juri Lelli <juri.le...@arm.com>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Kirill Tkhai <ktk...@parallels.com>
Cc: Juri Lelli <juri.le...@gmail.com>
Cc: linux-kernel@vger.kernel.org
Fixes: 3960c8c0c789 ("sched: Make dl_task_time() use task_rq_lock()")
---
kernel/sched/deadline.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index dbf12a9..519e468 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -538,7 +538,7 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer
*timer)
unsigned long flags;
struct rq *rq;
- rq = task_rq_lock(current, &flags);
+ rq = task_rq_lock(p, &flags);
/*
* We need to take care of several possible races here:
@@ -593,7 +593,7 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer
*timer)
push_dl_task(rq);
#endif
unlock:
- task_rq_unlock(rq, current, &flags);
+ task_rq_unlock(rq, p, &flags);
return HRTIMER_NORESTART;
}
--
2.3.0
--
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