This is a note to let you know that I've just added the patch titled
MIPS: IRQ: Fix disable_irq on CPU IRQs
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-irq-fix-disable_irq-on-cpu-irqs.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a3e6c1eff54878506b2dddcc202df9cc8180facb Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@xxxxxxxxxxx>
Date: Thu, 15 Jan 2015 19:05:28 +0100
Subject: MIPS: IRQ: Fix disable_irq on CPU IRQs
From: Felix Fietkau <nbd@xxxxxxxxxxx>
commit a3e6c1eff54878506b2dddcc202df9cc8180facb upstream.
If the irq_chip does not define .irq_disable, any call to disable_irq
will defer disabling the IRQ until it fires while marked as disabled.
This assumes that the handler function checks for this condition, which
handle_percpu_irq does not. In this case, calling disable_irq leads to
an IRQ storm, if the interrupt fires while disabled.
This optimization is only useful when disabling the IRQ is slow, which
is not true for the MIPS CPU IRQ.
Disable this optimization by implementing .irq_disable and .irq_enable
Signed-off-by: Felix Fietkau <nbd@xxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/8949/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/irq_cpu.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/arch/mips/kernel/irq_cpu.c
+++ b/arch/mips/kernel/irq_cpu.c
@@ -56,6 +56,8 @@ static struct irq_chip mips_cpu_irq_cont
.irq_mask_ack = mask_mips_irq,
.irq_unmask = unmask_mips_irq,
.irq_eoi = unmask_mips_irq,
+ .irq_disable = mask_mips_irq,
+ .irq_enable = unmask_mips_irq,
};
/*
@@ -92,6 +94,8 @@ static struct irq_chip mips_mt_cpu_irq_c
.irq_mask_ack = mips_mt_cpu_irq_ack,
.irq_unmask = unmask_mips_irq,
.irq_eoi = unmask_mips_irq,
+ .irq_disable = mask_mips_irq,
+ .irq_enable = unmask_mips_irq,
};
void __init mips_cpu_irq_init(void)
Patches currently in stable-queue which might be from nbd@xxxxxxxxxxx are
queue-3.18/mips-irq-fix-disable_irq-on-cpu-irqs.patch
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