media: gpio-ir-tx: Driver does not behave with PREEMPT_RT

This driver bit-bangs a signal with interrupts disabled. The signal can
last for up to half a second (IR_MAX_DURATION).

A much better way of transmitting IR is using the pwm-ir-tx driver,
which does not disable interrupts.

Signed-off-by: Sean Young <[e-mail]>
Acked-by: Sebastian Andrzej Siewior <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/rc/Kconfig

···
 	tristate "GPIO IR Bit Banging Transmitter"
 	depends on LIRC
 	depends on (OF && GPIOLIB) || COMPILE_TEST
+	depends on !PREEMPT_RT
 	help
 	   Say Y if you want to a GPIO based IR transmitter. This is a
 	   bit banging driver.