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Commit 8b4f68b4 authored by Kefeng Wang's avatar Kefeng Wang Committed by Greg Kroah-Hartman
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genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n 



commit e8458e7afa855317b14915d7b86ab3caceea7eb6 upstream.

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: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarMukesh 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: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cd5b06a9

kernel/irq/irqdesc.c

+1 −0
Original line number Diff line number Diff line
@@ -554,6 +554,7 @@ 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();