| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 52/69] genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n | Date | Mon, 15 Apr 2019 20:59:10 +0200 |
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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 @@ -535,6 +535,7 @@ 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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