linux-kernel - [PATCH] irqchip/mips-gic: Fix IRQs in gic_dev

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Date:	Mon, 23 May 2016 12:05:52 +0100
From:	Harvey Hunt <harvey.hunt@...tec.com>
To:	<tglx@...utronix.de>, <jason@...edaemon.net>,
	<marc.zyngier@....com>
CC:	Harvey Hunt <harvey.hunt@...tec.com>, <linux-mips@...ux-mips.org>,
	<linux-kernel@...r.kernel.org>, Qais Yousef <qsyousef@...il.com>
Subject: [PATCH] irqchip/mips-gic: Fix IRQs in gic_dev_domain

When allocating a new device IRQ, gic_dev_domain_alloc() correctly calls
irq_domain_set_hwirq_and_chip(), but gic_irq_domain_alloc() does not. This
means that gic_irq_domain believes all IRQs from the dev domain have an
hwirq of 0 and creates incorrect mappings in the linear_revmap. As
gic_irq_domain is a parent of the gic_dev_domain, this leads to an
inability to boot on devices with a GIC. Excerpt of the error:

[    2.297649] irq 0: nobody cared (try booting with the "irqpoll" option)
...
[    2.436963] handlers:
[    2.439492] Disabling IRQ #0

Fix this by calling irq_domain_set_hwirq_and_chip() for both the dev and
irq domain.

Now that we are modifying the parent domain, be sure to clear it up in
case of an allocation error.

Fixes: c98c1822ee13 ("irqchip/mips-gic: Add device hierarchy domain")
Fixes: 2af70a962070 ("irqchip/mips-gic: Add a IPI hierarchy domain")
Signed-off-by: Harvey Hunt <harvey.hunt@...tec.com>
Tested-by: Govindraj Raja <Govindraj.Raja@...tec.com> # On Pistachio SoC
Reviewed-by: Matt Redfearn <matt.redfearn@...tec.com>
Cc: <linux-mips@...ux-mips.org>
Cc: <linux-kernel@...r.kernel.org>
Cc: Qais Yousef <qsyousef@...il.com>
---
 drivers/irqchip/irq-mips-gic.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 4dffccf..40fb120 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -734,6 +734,12 @@ static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
 		/* verify that it doesn't conflict with an IPI irq */
 		if (test_bit(spec->hwirq, ipi_resrv))
 			return -EBUSY;
+
+		hwirq = GIC_SHARED_TO_HWIRQ(spec->hwirq);
+
+		return irq_domain_set_hwirq_and_chip(d, virq, hwirq,
+						     &gic_level_irq_controller,
+						     NULL);
 	} else {
 		base_hwirq = find_first_bit(ipi_resrv, gic_shared_intrs);
 		if (base_hwirq == gic_shared_intrs) {
@@ -855,10 +861,14 @@ static int gic_dev_domain_alloc(struct irq_domain *d, unsigned int virq,
 						    &gic_level_irq_controller,
 						    NULL);
 		if (ret)
-			return ret;
+			goto error;
 	}
 
 	return 0;
+
+error:
+	irq_domain_free_irqs_parent(d, virq, nr_irqs);
+	return ret;
 }
 
 void gic_dev_domain_free(struct irq_domain *d, unsigned int virq,
-- 
2.8.2