Commit e8458e7a authored Apr 04, 2019 by Kefeng Wang Committed by Thomas Gleixner Apr 05, 2019

genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n



When CONFIG_SPARSE_IRQ is disable, the request_mutex in struct irq_desc
is not initialized which causes malfunction.

Fixes: 9114014c ("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

parent 95c5c618

kernel/irq/irqdesc.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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();

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