summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorFelix Fietkau <nbd@openwrt.org>2015-01-15 19:05:28 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-02-11 15:00:51 +0800
commit83c9c2c5a8ea60d2b9d8f50f4c201cafc57527af (patch)
tree1f7cb66cc0aaa9d4cd8042b5aa17981aa94cbbc1
parentdbbd2788801872e41894c4d371bf1155a355d382 (diff)
MIPS: IRQ: Fix disable_irq on CPU IRQs
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@openwrt.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8949/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/mips/kernel/irq_cpu.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/mips/kernel/irq_cpu.c b/arch/mips/kernel/irq_cpu.c
index e498f2b3646a..f5598e25e906 100644
--- 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_controller = {
.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_controller = {
.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)