From: Justin Chen <justinpopo6@xxxxxxxxx>
Commit a3e6c1eff548 ("MIPS: IRQ: Fix disabled_irq on CPU IRQs") fixes
an issue where disable_irq did not actually disable the irq. The
bug caused our IPIs to not be disabled, which actually is the correct
behavior.
With the addition of Commit a3e6c1eff548 ("MIPS: IRQ: Fix disabled_irq
on CPU IRQs"), the IPIs were getting disabled going into suspend,
thus schedule_ipi() was not being called. This caused deadlocks where
schedulable task were not being scheduled and other cpus were waiting
for them to do something.
Add the IRQF_NO_SUSPEND flag so an irq_disable will not be called
on the IPIs during suspend.
Signed-off-by: Justin Chen <justinpopo6@xxxxxxxxx>
Fixes: a3e6c1eff548 ("MIPS: IRQ: Fix disabled_irq on CPU IRQs")
---
arch/mips/kernel/smp-bmips.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c
index 1b070a76fcdd..3b900a04d724 100644
--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -168,10 +168,10 @@ static void bmips_prepare_cpus(unsigned int max_cpus)
return;
}
- if (request_irq(IPI0_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
+ if (request_irq(IPI0_IRQ, bmips_ipi_interrupt, IRQF_PERCPU | IRQF_NO_SUSPEND,
"smp_ipi0", NULL))
panic("Can't request IPI0 interrupt");
- if (request_irq(IPI1_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
+ if (request_irq(IPI1_IRQ, bmips_ipi_interrupt, IRQF_PERCPU | IRQF_NO_SUSPEND,
"smp_ipi1", NULL))
panic("Can't request IPI1 interrupt");
}
--
2.14.1
