releases/4.19.35/genirq-initialize-request_mutex-if-config_sparse_irq-n.patch

   1 From e8458e7afa855317b14915d7b86ab3caceea7eb6 Mon Sep 17 00:00:00 2001
   2 From: Kefeng Wang <wangkefeng.wang@huawei.com>
   3 Date: Thu, 4 Apr 2019 15:45:12 +0800
   4 Subject: genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n
   5
   6 From: Kefeng Wang <wangkefeng.wang@huawei.com>
   7
   8 commit e8458e7afa855317b14915d7b86ab3caceea7eb6 upstream.
   9
  10 When CONFIG_SPARSE_IRQ is disable, the request_mutex in struct irq_desc
  11 is not initialized which causes malfunction.
  12
  13 Fixes: 9114014cf4e6 ("genirq: Add mutex to irq desc to serialize request/free_irq()")
  14 Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
  15 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  16 Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
  17 Cc: Marc Zyngier <marc.zyngier@arm.com>
  18 Cc: <linux-arm-kernel@lists.infradead.org>
  19 Cc: stable@vger.kernel.org
  20 Link: https://lkml.kernel.org/r/20190404074512.145533-1-wangkefeng.wang@huawei.com
  21 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  22
  23 ---
  24  kernel/irq/irqdesc.c |    1 +
  25  1 file changed, 1 insertion(+)
  26
  27 --- a/kernel/irq/irqdesc.c
  28 +++ b/kernel/irq/irqdesc.c
  29 @@ -554,6 +554,7 @@ int __init early_irq_init(void)
  30                 alloc_masks(&desc[i], node);
  31                 raw_spin_lock_init(&desc[i].lock);
  32                 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
  33 +               mutex_init(&desc[i].request_mutex);
  34                 desc_set_defaults(i, &desc[i], node, NULL, NULL);
  35         }
  36         return arch_early_irq_init();