Patch "irqchip/mips-gic: Implement activate op for device domain" has been added to the 4.7-stable tree

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 <[email protected]> know about it.

From: Paul Burton <[email protected]>
Date: Fri, 19 Aug 2016 18:07:15 +0100
Subject: irqchip/mips-gic: Implement activate op for device domain

From: Paul Burton <[email protected]>

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.

---
 drivers/irqchip/irq-mips-gic.c |    7 +++++++
 1 file changed, 7 insertions(+)

@@ -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 [email protected] 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