43 lines
1.6 KiB
Diff
43 lines
1.6 KiB
Diff
From bf66e1b2e893b51c1298013bb82ed083f495d292 Mon Sep 17 00:00:00 2001
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Message-Id: <bf66e1b2e893b51c1298013bb82ed083f495d292.1601675152.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Thu, 16 Nov 2017 16:48:48 +0100
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Subject: [PATCH 152/333] locking/rtmutex: re-init the wait_lock in
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rt_mutex_init_proxy_locked()
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
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We could provide a key-class for the lockdep (and fixup all callers) or
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move the init to all callers (like it was) in order to avoid lockdep
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seeing a double-lock of the wait_lock.
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Reported-by: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
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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 | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
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index b38c3a92dce8..94788662b2f2 100644
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--- a/kernel/locking/rtmutex.c
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+++ b/kernel/locking/rtmutex.c
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@@ -2281,6 +2281,14 @@ void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
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struct task_struct *proxy_owner)
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{
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__rt_mutex_init(lock, NULL, NULL);
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+#ifdef CONFIG_DEBUG_SPINLOCK
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+ /*
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+ * get another key class for the wait_lock. LOCK_PI and UNLOCK_PI is
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+ * holding the ->wait_lock of the proxy_lock while unlocking a sleeping
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+ * lock.
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+ */
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+ raw_spin_lock_init(&lock->wait_lock);
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+#endif
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debug_rt_mutex_proxy_lock(lock, proxy_owner);
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rt_mutex_set_owner(lock, proxy_owner);
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}
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--
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2.17.1
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