4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Justin Chen <justinpo...@gmail.com>
commit 06a3f0c9f2725f5d7c63c4203839373c9bd00c28 upstream.
Commit a3e6c1eff548 ("MIPS: IRQ: Fix disable_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 disable_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 <justinpo...@gmail.com>
Fixes: a3e6c1eff548 ("MIPS: IRQ: Fix disabled_irq on CPU IRQs")
Cc: Florian Fainelli <f.faine...@gmail.com>
Cc: linux-m...@linux-mips.org
Cc: sta...@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17385/
[jho...@kernel.org: checkpatch: wrap long lines and fix commit refs]
Signed-off-by: James Hogan <jho...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/mips/kernel/smp-bmips.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -166,11 +166,11 @@ static void bmips_prepare_cpus(unsigned
return;
}
- if (request_irq(IPI0_IRQ, bmips_ipi_interrupt, IRQF_PERCPU,
- "smp_ipi0", NULL))
+ 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,
- "smp_ipi1", NULL))
+ if (request_irq(IPI1_IRQ, bmips_ipi_interrupt,
+ IRQF_PERCPU | IRQF_NO_SUSPEND, "smp_ipi1", NULL))
panic("Can't request IPI1 interrupt");
}
