Even though we weren't calling a blocking function within the dynid
spinlock, we do not need a spinlock here but can and should be using
a mutex.
Reported-by: NJiri Slaby <jirislaby@gmail.com>
Tested-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NDominik Brodowski <linux@dominikbrodowski.net>