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sched/core: Add clearing of ->dl_server in put_prev_task_balance()

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.

Fixes: 63ba8422f876 ("sched/deadline: Introduce deadline servers")
Signed-off-by: "Joel Fernandes (Google)" <joel@joelfernandes.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/d184d554434bedbad0581cb34656582d78655150.1716811044.git.bristot@kernel.org

authored by

Joel Fernandes (Google) and committed by
Peter Zijlstra c2459100 f23c042c

+8 -8
+8 -8
kernel/sched/core.c
··· 5801 5801 #endif 5802 5802 5803 5803 put_prev_task(rq, prev); 5804 + 5805 + /* 5806 + * We've updated @prev and no longer need the server link, clear it. 5807 + * Must be done before ->pick_next_task() because that can (re)set 5808 + * ->dl_server. 5809 + */ 5810 + if (prev->dl_server) 5811 + prev->dl_server = NULL; 5804 5812 } 5805 5813 5806 5814 /* ··· 5851 5843 5852 5844 restart: 5853 5845 put_prev_task_balance(rq, prev, rf); 5854 - 5855 - /* 5856 - * We've updated @prev and no longer need the server link, clear it. 5857 - * Must be done before ->pick_next_task() because that can (re)set 5858 - * ->dl_server. 5859 - */ 5860 - if (prev->dl_server) 5861 - prev->dl_server = NULL; 5862 5846 5863 5847 for_each_class(class) { 5864 5848 p = class->pick_next_task(rq);