linux-kernel - [PATCH] irqdomain: Improve diagnostics when a domain mapping fails

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Message-Id: <1342777443-11022-1-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Fri, 20 Jul 2012 10:44:03 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] irqdomain: Improve diagnostics when a domain mapping fails

When the map operation fails log the error code we get and add a WARN_ON()
so we get a backtrace (which should help work out which interrupt is the
source of the issue).

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 kernel/irq/irqdomain.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 68920c4..5dbcd30 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -318,7 +318,7 @@ int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 {
 	unsigned int virq = irq_base;
 	irq_hw_number_t hwirq = hwirq_base;
-	int i;
+	int i, ret;
 
 	pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
 		of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
@@ -339,11 +339,16 @@ int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 
 		irq_data->hwirq = hwirq;
 		irq_data->domain = domain;
-		if (domain->ops->map && domain->ops->map(domain, virq, hwirq)) {
-			pr_err("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq);
-			irq_data->domain = NULL;
-			irq_data->hwirq = 0;
-			goto err_unmap;
+		if (domain->ops->map) {
+			ret = domain->ops->map(domain, virq, hwirq);
+			if (ret != 0) {
+				pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
+				       virq, hwirq, ret);
+				WARN_ON(1);
+				irq_data->domain = NULL;
+				irq_data->hwirq = 0;
+				goto err_unmap;
+			}
 		}
 
 		if (hwirq < domain->revmap_data.linear.size) {
-- 
1.7.10.4

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