On Thu, 17 Aug 2017 17:10:07 -0400
Steven Rostedt [off-list ref] wrote:

Instead of playing games with taking the lock, the only way this race
is hit, is if the partition is being deleted and the sysfs attribute is
being read at the same time, correct? In that case, just return
-ENODEV, and be done with it.

Nevermind that wont work. Too bad there's not a mutex_lock_timeout()
that we could use in a loop. It would solve the issue of forward
progress with RT tasks, and will break after a timeout in case of
deadlock.

-- Steve