Messages in this thread Patch in this message | | | Date | Fri, 17 Jan 2020 12:41:23 -0500 | From | Steven Rostedt <> | Subject | [PATCH RT 12/32] posix-timers: Unlock expiry lock in the early return |
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4.19.94-rt39-rc1 stable review patch. If anyone has any objections, please let me know.
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[ Upstream commit 356a2781375ec58521a9bc3f500488745990c242 ]
Patch ("posix-timers: Add expiry lock") acquired a lock in run_posix_cpu_timers() but didn't drop the lock in the early return.
Unlock the lock in the early return path.
Reported-by: kbuild test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> --- kernel/time/posix-cpu-timers.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index 765e700962ab..c9964dc3276b 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -1175,8 +1175,10 @@ static void __run_posix_cpu_timers(struct task_struct *tsk) expiry_lock = this_cpu_ptr(&cpu_timer_expiry_lock); spin_lock(expiry_lock); - if (!lock_task_sighand(tsk, &flags)) + if (!lock_task_sighand(tsk, &flags)) { + spin_unlock(expiry_lock); return; + } /* * Here we take off tsk->signal->cpu_timers[N] and * tsk->cpu_timers[N] all the timers that are firing, and -- 2.24.1
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