[PATCH v4 05/14] irqchip/irq-bcm7038-l1: Restrict affinity setting to MIPS
From: Florian Fainelli <f.fainelli@gmail.com>
Date: 2021-10-09 02:20:46
Also in:
linux-arm-kernel, linux-mips, lkml
Subsystem:
broadcom bmips mips architecture, irqchip drivers, the rest · Maintainers:
Florian Fainelli, Thomas Gleixner, Linus Torvalds
Only MIPS based platforms using this interrupt controller as first level interrupt controller can actually change the affinity of interrupts by re-programming the affinity mask of the interrupt controller and use another word group to have another CPU process the interrupt. When this interrupt is used as a second level interrupt controller on ARM/ARM64 there is no way to change the interrupt affinity. This fixes a NULL pointer de-reference while trying to change the affinity since there is only a single word group in that case, and we would have been overruning the intc->cpus[] array. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> --- drivers/irqchip/irq-bcm7038-l1.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/irqchip/irq-bcm7038-l1.c b/drivers/irqchip/irq-bcm7038-l1.c
index 3c4e348c661e..357570dd8780 100644
--- a/drivers/irqchip/irq-bcm7038-l1.c
+++ b/drivers/irqchip/irq-bcm7038-l1.c@@ -191,6 +191,7 @@ static void bcm7038_l1_mask(struct irq_data *d) raw_spin_unlock_irqrestore(&intc->lock, flags); } +#if defined(CONFIG_MIPS) && defined(CONFIG_SMP) static int bcm7038_l1_set_affinity(struct irq_data *d, const struct cpumask *dest, bool force)
@@ -217,6 +218,7 @@ static int bcm7038_l1_set_affinity(struct irq_data *d, return 0; } +#endif static int __init bcm7038_l1_init_one(struct device_node *dn, unsigned int idx,
@@ -365,7 +367,9 @@ static struct irq_chip bcm7038_l1_irq_chip = { .name = "bcm7038-l1", .irq_mask = bcm7038_l1_mask, .irq_unmask = bcm7038_l1_unmask, +#if defined(CONFIG_SMP) && defined(CONFIG_MIPS) .irq_set_affinity = bcm7038_l1_set_affinity, +#endif #ifdef CONFIG_PM_SLEEP .irq_set_wake = bcm7038_l1_set_wake, #endif
--
2.25.1