This is a note to let you know that I've just added the patch titled
irqchip/mips-gic: Implement activate op for device domain
to the 4.7-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:
irqchip-mips-gic-implement-activate-op-for-device-domain.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2564970a381651865364974ea414384b569cb9c0 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@xxxxxxxxxx>
Date: Fri, 19 Aug 2016 18:07:15 +0100
Subject: irqchip/mips-gic: Implement activate op for device domain
From: Paul Burton <paul.burton@xxxxxxxxxx>
commit 2564970a381651865364974ea414384b569cb9c0 upstream.
If an IRQ is setup using __setup_irq(), which is used by the
request_irq() family of functions, and we are using an SMP kernel then
the affinity of the IRQ will be set via setup_affinity() immediately
after the IRQ is enabled. This call to gic_set_affinity() will lead to
the interrupt being mapped to a VPE. However there are other ways to use
IRQs which don't cause affinity to be set, for example if it is used to
chain to another IRQ controller with irq_set_chained_handler_and_data().
The irq_set_chained_handler_and_data() code path will enable the IRQ,
but will not trigger a call to gic_set_affinity() and in this case
nothing will map the interrupt to a VPE, meaning that the interrupt is
never received.
Fix this by implementing the activate operation for the GIC device IRQ
domain, using gic_shared_irq_domain_map() to map the interrupt to the
correct pin of cpu 0.
Fixes: c98c1822ee13 ("irqchip/mips-gic: Add device hierarchy domain")
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Link: http://lkml.kernel.org/r/20160819170715.27820-2-paul.burton@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-mips-gic.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -893,10 +893,17 @@ void gic_dev_domain_free(struct irq_doma
return;
}
+static void gic_dev_domain_activate(struct irq_domain *domain,
+ struct irq_data *d)
+{
+ gic_shared_irq_domain_map(domain, d->irq, d->hwirq, 0);
+}
+
static struct irq_domain_ops gic_dev_domain_ops = {
.xlate = gic_dev_domain_xlate,
.alloc = gic_dev_domain_alloc,
.free = gic_dev_domain_free,
+ .activate = gic_dev_domain_activate,
};
static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
Patches currently in stable-queue which might be from paul.burton@xxxxxxxxxx are
queue-4.7/irqchip-mips-gic-implement-activate-op-for-device-domain.patch
queue-4.7/irqchip-mips-gic-cleanup-chip-and-handler-setup.patch
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