linux-kernel - [PATCH] media: gpio-ir-tx: Driver does not behave with PREEMPT

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Message-ID: <20240921190721.6082-1-sean@mess.org>
Date: Sat, 21 Sep 2024 20:07:20 +0100
From: Sean Young <sean@...s.org>
To: linux-media@...r.kernel.org,
	linux-rt-users@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] 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 <sean@...s.org>
---
 drivers/media/rc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 74d69ce22a33e..0a8aeafdb7e07 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -184,6 +184,7 @@ config IR_GPIO_TX
 	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.
-- 
2.46.1