From: Johan Hovold Date: Mon, 13 Feb 2023 10:42:44 +0000 (+0100) Subject: irqdomain: Fix disassociation race X-Git-Tag: v6.6.7~3510^2^2~1^2~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3f883c38f5628f46b30bccf090faec054088e262;p=platform%2Fkernel%2Flinux-starfive.git irqdomain: Fix disassociation race The global irq_domain_mutex is held when mapping interrupts from non-hierarchical domains but currently not when disposing them. This specifically means that updates of the domain mapcount is racy (currently only used for statistics in debugfs). Make sure to hold the global irq_domain_mutex also when disposing mappings from non-hierarchical domains. Fixes: 9dc6be3d4193 ("genirq/irqdomain: Add map counter") Cc: stable@vger.kernel.org # 4.13 Tested-by: Hsin-Yi Wang Tested-by: Mark-PK Tsai Signed-off-by: Johan Hovold Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20230213104302.17307-3-johan+linaro@kernel.org --- diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 6661de1..f77549a 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -538,6 +538,9 @@ static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq) return; hwirq = irq_data->hwirq; + + mutex_lock(&irq_domain_mutex); + irq_set_status_flags(irq, IRQ_NOREQUEST); /* remove chip and handler */ @@ -557,6 +560,8 @@ static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq) /* Clear reverse map for this hwirq */ irq_domain_clear_mapping(domain, hwirq); + + mutex_unlock(&irq_domain_mutex); } static int irq_domain_associate_locked(struct irq_domain *domain, unsigned int virq,