MIPS: BMIPS: Do not mask IPIs during suspend
authorJustin Chen <justinpopo6@gmail.com>
Thu, 28 Sep 2017 00:15:15 +0000 (17:15 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 15 Mar 2018 09:54:31 +0000 (10:54 +0100)
commit26f1a4666090145a8b4f5d43f65d7fc3be2594a1
tree96c7bf33affc10a5fbbec8b4cced1e624dd029a9
parent6c6f1e60b5e4be19edf3978123fc13cb1b8d68f9
MIPS: BMIPS: Do not mask IPIs during suspend

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 <justinpopo6@gmail.com>
Fixes: a3e6c1eff548 ("MIPS: IRQ: Fix disabled_irq on CPU IRQs")
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17385/
[jhogan@kernel.org: checkpatch: wrap long lines and fix commit refs]
Signed-off-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/mips/kernel/smp-bmips.c