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From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 1 Apr 2017 12:50:59 +0200
Subject: [PATCH] rtmutex: Make lock_killable work
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.9/older/patches-4.9.20-rt16.tar.xz
Locking an rt mutex killable does not work because signal handling is
restricted to TASK_INTERRUPTIBLE.
Use signal_pending_state() unconditionaly.
Cc: rt-stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/locking/rtmutex.c | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1206,18 +1206,13 @@ static int __sched
if (try_to_take_rt_mutex(lock, current, waiter))
break;
- /*
- * TASK_INTERRUPTIBLE checks for signals and
- * timeout. Ignored otherwise.
- */
- if (unlikely(state == TASK_INTERRUPTIBLE)) {
- /* Signal pending? */
- if (signal_pending(current))
- ret = -EINTR;
- if (timeout && !timeout->task)
- ret = -ETIMEDOUT;
- if (ret)
- break;
+ if (timeout && !timeout->task) {
+ ret = -ETIMEDOUT;
+ break;
+ }
+ if (signal_pending_state(state, current)) {
+ ret = -EINTR;
+ break;
}
raw_spin_unlock_irq(&lock->wait_lock);
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