[patch RT 1/4] rtmutex: Make lock_killable work

Thomas Gleixner
2017-04-01T11:32:06Z

[-- Attachment #1: rtmutex-Make-lock_killable-work.patch --]
[-- Type: text/plain, Size: 1011 bytes --]

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>
---
kernel/locking/rtmutex.c | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)

--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1633,18 +1633,13 @@ 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;
}

if (ww_ctx && ww_ctx->acquired > 0) {