target/linux/bcm27xx/patches-4.19/950-0314-Fix-for-Pisound-kernel-module-in-Real-Time-kernel-co.patch

   1 From c93b0344d24ba63e0e4caeb693a9fcb7320aae3a Mon Sep 17 00:00:00 2001
   2 From: Giedrius <giedrius@blokas.io>
   3 Date: Wed, 27 Feb 2019 14:27:28 +0000
   4 Subject: [PATCH] Fix for Pisound kernel module in Real Time kernel
   5  configuration.
   6
   7 When handler of data_available interrupt is fired, queue_work ends up
   8 getting called and it can block on a spin lock which is not allowed in
   9 interrupt context. The fix was to run the handler from a thread context
  10 instead.
  11 ---
  12  sound/soc/bcm/pisound.c | 8 ++++----
  13  1 file changed, 4 insertions(+), 4 deletions(-)
  14
  15 --- a/sound/soc/bcm/pisound.c
  16 +++ b/sound/soc/bcm/pisound.c
  17 @@ -1,6 +1,6 @@
  18  /*
  19   * Pisound Linux kernel module.
  20 - * Copyright (C) 2016-2017  Vilniaus Blokas UAB, https://blokas.io/pisound
  21 + * Copyright (C) 2016-2019  Vilniaus Blokas UAB, https://blokas.io/pisound
  22   *
  23   * This program is free software; you can redistribute it and/or
  24   * modify it under the terms of the GNU General Public License
  25 @@ -532,10 +532,10 @@ static void pisnd_spi_gpio_uninit(void)
  26
  27  static int pisnd_spi_gpio_irq_init(struct device *dev)
  28  {
  29 -       return request_irq(
  30 -               gpiod_to_irq(data_available),
  31 +       return request_threaded_irq(
  32 +               gpiod_to_irq(data_available), NULL,
  33                 data_available_interrupt_handler,
  34 -               IRQF_TIMER | IRQF_TRIGGER_RISING,
  35 +               IRQF_TIMER | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
  36                 "data_available_int",
  37                 NULL
  38                 );