35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
From e3c2fa3a8755063343e3ce1072db61a9044dda46 Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Wed, 2 Dec 2015 11:34:07 +0100
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Subject: [PATCH 127/325] rtmutex: trylock is okay on -RT
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.115-rt48.tar.xz
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non-RT kernel could deadlock on rt_mutex_trylock() in softirq context. On
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-RT we don't run softirqs in IRQ context but in thread context so it is
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not a issue here.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/locking/rtmutex.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
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index 9562aaa2afdc..72abe7c121fa 100644
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--- a/kernel/locking/rtmutex.c
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+++ b/kernel/locking/rtmutex.c
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@@ -1583,7 +1583,11 @@ int __sched rt_mutex_trylock(struct rt_mutex *lock)
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{
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int ret;
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+#ifdef CONFIG_PREEMPT_RT_FULL
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+ if (WARN_ON_ONCE(in_irq() || in_nmi()))
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+#else
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if (WARN_ON_ONCE(in_irq() || in_nmi() || in_serving_softirq()))
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+#endif
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return 0;
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ret = rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock);
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--
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2.25.1
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