[Bug 289120] A time-of-check to time-of-use race exists in gpioc_kqread() of GPIO subsystem

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289120

--- Comment #6 from Ahmad Khalifa <vexeduxr@FreeBSD.org> ---
The priv->mtx lock is given to kqueue through knlist_init_mtx (which is called
in gpioc_open). It gets locked by knlist_mtx_lock (which is a generic
implementation, since we never give one to kqueue) before it calls the knote's
f_event (which in our case is gpioc_kqread).

As for the ioctl race, yes, that does look like an oversight. I will try to get
that fixed ASAP. Thank you for the report. :)

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