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();