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sched/hmp: Disable interrupts when resetting all task stats

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Taking the pi_lock without disabling interrupts in reset_all_task_stats()
is problematic. In that an interrupt can end up waking a task which in
turn needs the pi_lock again causing a deadlock. Disable interrupts along
with taking the lock to avoid this problem.

Change-Id: If27cb2bb3fcaafa5c8435f3c2e0e4be9b8f1e987
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
This commit is contained in:
Syed Rameez Mustafa 2016-10-28 12:12:41 -07:00
parent bcd8ec9210
commit 6385a475e0
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/hmp.c
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@ -3106,9 +3106,9 @@ static void reset_all_task_stats(void)
read_lock(&tasklist_lock);
do_each_thread(g, p) {
raw_spin_lock(&p->pi_lock);
raw_spin_lock_irq(&p->pi_lock);
reset_task_stats(p);
raw_spin_unlock(&p->pi_lock);
raw_spin_unlock_irq(&p->pi_lock);
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
}