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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 2 Dec 2015 11:34:07 +0100
Subject: [PATCH 127/351] rtmutex: trylock is okay on -RT
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=aca2cbeb348d796df3306d9f3aee897235b3dc19
non-RT kernel could deadlock on rt_mutex_trylock() in softirq context. On
-RT we don't run softirqs in IRQ context but in thread context so it is
not a issue here.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/locking/rtmutex.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index a5ec4f68527e..4bec24dfafc6 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1583,7 +1583,11 @@ int __sched rt_mutex_trylock(struct rt_mutex *lock)
{
int ret;
+#ifdef CONFIG_PREEMPT_RT_FULL
+ if (WARN_ON_ONCE(in_irq() || in_nmi()))
+#else
if (WARN_ON_ONCE(in_irq() || in_nmi() || in_serving_softirq()))
+#endif
return 0;
ret = rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock);
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