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.

diff --git a/sound/soc/bcm/pisound.c b/sound/soc/bcm/pisound.c
index ab9ea1f..1c5100b 100644 (file)
--- 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
                );