linux-kernel - [PATCH] irq/irqdomain: change bail out condition for irq_domain

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Date:	Tue, 20 Sep 2011 23:36:29 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: [PATCH] irq/irqdomain: change bail out condition for irq_domain_add()

I tried to convert x86 to this infrastructure and I run into
|BUG: unable to handle kernel NULL pointer dereference at 00000014

(d || d->domain) is kinda bogus because if d is NULL it will check for
d->domain which should fail. It seems that the code needs the irq_data
to be present and there should be no irq_domain set yet. This patch does
this.

My convert to this infrastructure still does not work with this patch
but I have enough for today.

Cc: Grant Likely <grant.likely@...retlab.ca>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 kernel/irq/irqdomain.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index d5828da..213089b 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -29,7 +29,7 @@ void irq_domain_add(struct irq_domain *domain)
 	 */
 	for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
 		d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
-		if (d || d->domain) {
+		if (!d || d->domain) {
 			/* things are broken; just report, don't clean up */
 			WARN(1, "error: irq_desc already assigned to a domain");
 			return;
-- 
1.7.6.3

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