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From: Julien Grall <julien.grall@arm.com>
Date: Wed, 21 Aug 2019 10:24:08 +0100
Subject: [PATCH 293/353] hrtimer: Don't grab the expiry lock for non-soft
hrtimer
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=092ae9a94d427cc8e7f9785d080600083352ff51
[ Upstream commit fd420354bea2f57c11f3de191dffdeea76531e76 ]
Acquiring the lock in hrtimer_grab_expiry_lock() is designed for
sleeping-locks and should not be used with disabled interrupts.
hrtimer_cancel() may invoke hrtimer_grab_expiry_lock() also for locks
which expire in hard-IRQ context.
Let hrtimer_cancel() invoke hrtimer_grab_expiry_lock() only for locks
which expire in softirq context.
Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
[bigeasy: rewrite changelog]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/time/hrtimer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index a868444c6154..303e8cb2b52b 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -961,7 +961,7 @@ void hrtimer_grab_expiry_lock(const struct hrtimer *timer)
{
struct hrtimer_clock_base *base = READ_ONCE(timer->base);
- if (base && base->cpu_base) {
+ if (timer->is_soft && base && base->cpu_base) {
spin_lock(&base->cpu_base->softirq_expiry_lock);
spin_unlock(&base->cpu_base->softirq_expiry_lock);
}
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