From: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx>
Paths using put_prev_task_balance() need to do a pick shortly
after. Make sure they also clear the ->dl_server on prev as a
part of that.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 63ba8422f876 ("sched/deadline: Introduce deadline servers")
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
---
kernel/sched/core.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index bcf2c4cc0522..08c409457152 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6006,6 +6006,14 @@ static void put_prev_task_balance(struct rq *rq, struct task_struct *prev,
#endif
put_prev_task(rq, prev);
+
+ /*
+ * We've updated @prev and no longer need the server link, clear it.
+ * Must be done before ->pick_next_task() because that can (re)set
+ * ->dl_server.
+ */
+ if (prev->dl_server)
+ prev->dl_server = NULL;
}
/*
@@ -6049,14 +6057,6 @@ __pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
restart:
put_prev_task_balance(rq, prev, rf);
- /*
- * We've updated @prev and no longer need the server link, clear it.
- * Must be done before ->pick_next_task() because that can (re)set
- * ->dl_server.
- */
- if (prev->dl_server)
- prev->dl_server = NULL;
-
for_each_class(class) {
p = class->pick_next_task(rq);
if (p)
--
2.45.1
