From: Johan Hovold johan+linaro@kernel.org
commit 3f883c38f5628f46b30bccf090faec054088e262 upstream.
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 hsinyi@chromium.org Tested-by: Mark-PK Tsai mark-pk.tsai@mediatek.com Signed-off-by: Johan Hovold johan+linaro@kernel.org Signed-off-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20230213104302.17307-3-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/irq/irqdomain.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -494,6 +494,9 @@ void irq_domain_disassociate(struct irq_ return;
hwirq = irq_data->hwirq; + + mutex_lock(&irq_domain_mutex); + irq_set_status_flags(irq, IRQ_NOREQUEST);
/* remove chip and handler */ @@ -513,6 +516,8 @@ void irq_domain_disassociate(struct 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,