| From e8458e7afa855317b14915d7b86ab3caceea7eb6 Mon Sep 17 00:00:00 2001 |
| From: Kefeng Wang <wangkefeng.wang@huawei.com> |
| Date: Thu, 4 Apr 2019 15:45:12 +0800 |
| Subject: genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n |
| |
| From: Kefeng Wang <wangkefeng.wang@huawei.com> |
| |
| commit e8458e7afa855317b14915d7b86ab3caceea7eb6 upstream. |
| |
| When CONFIG_SPARSE_IRQ is disable, the request_mutex in struct irq_desc |
| is not initialized which causes malfunction. |
| |
| Fixes: 9114014cf4e6 ("genirq: Add mutex to irq desc to serialize request/free_irq()") |
| Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> |
| Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
| Reviewed-by: Mukesh Ojha <mojha@codeaurora.org> |
| Cc: Marc Zyngier <marc.zyngier@arm.com> |
| Cc: <linux-arm-kernel@lists.infradead.org> |
| Cc: stable@vger.kernel.org |
| Link: https://lkml.kernel.org/r/20190404074512.145533-1-wangkefeng.wang@huawei.com |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| kernel/irq/irqdesc.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/kernel/irq/irqdesc.c |
| +++ b/kernel/irq/irqdesc.c |
| @@ -558,6 +558,7 @@ int __init early_irq_init(void) |
| alloc_masks(&desc[i], node); |
| raw_spin_lock_init(&desc[i].lock); |
| lockdep_set_class(&desc[i].lock, &irq_desc_lock_class); |
| + mutex_init(&desc[i].request_mutex); |
| desc_set_defaults(i, &desc[i], node, NULL, NULL); |
| } |
| return arch_early_irq_init(); |