1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0314-Fix-for-Pisound-kernel-module-in-Real-Time-kernel-co.patch b/target/linux/brcm2708/patches-4.19/950-0314-Fix-for-Pisound-kernel-module-in-Real-Time-kernel-co.patch
new file mode 100644
index 0000000000..657d70d82a
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0314-Fix-for-Pisound-kernel-module-in-Real-Time-kernel-co.patch
@@ -0,0 +1,38 @@
+From c93b0344d24ba63e0e4caeb693a9fcb7320aae3a Mon Sep 17 00:00:00 2001
+From: Giedrius <giedrius@blokas.io>
+Date: Wed, 27 Feb 2019 14:27:28 +0000
+Subject: [PATCH] Fix for Pisound kernel module in Real Time kernel
+ configuration.
+
+When handler of data_available interrupt is fired, queue_work ends up
+getting called and it can block on a spin lock which is not allowed in
+interrupt context. The fix was to run the handler from a thread context
+instead.
+---
+ sound/soc/bcm/pisound.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+--- a/sound/soc/bcm/pisound.c
++++ b/sound/soc/bcm/pisound.c
+@@ -1,6 +1,6 @@
+ /*
+  * Pisound Linux kernel module.
+- * Copyright (C) 2016-2017  Vilniaus Blokas UAB, https://blokas.io/pisound
++ * Copyright (C) 2016-2019  Vilniaus Blokas UAB, https://blokas.io/pisound
+  *
+  * This program is free software; you can redistribute it and/or
+  * modify it under the terms of the GNU General Public License
+@@ -532,10 +532,10 @@ static void pisnd_spi_gpio_uninit(void)
+ 
+ static int pisnd_spi_gpio_irq_init(struct device *dev)
+ {
+-	return request_irq(
+-		gpiod_to_irq(data_available),
++	return request_threaded_irq(
++		gpiod_to_irq(data_available), NULL,
+ 		data_available_interrupt_handler,
+-		IRQF_TIMER | IRQF_TRIGGER_RISING,
++		IRQF_TIMER | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ 		"data_available_int",
+ 		NULL
+ 		);