Commit eef24afb authored Sep 14, 2011 by Rob Herring Committed by Thomas Gleixner Sep 20, 2011

irq: Fix check for already initialized irq_domain in irq_domain_add



The sanity check in irq_domain_add() tests desc->irq_data != NULL or
irq_data->domain != NULL. This prevents adding an irq_domain to a irq
descriptor when irq_data exists, which true when the irq descriptor
exists.

This went unnoticed so far as the simple domain code did not enter
this code path because domain->nr_irqs is always 0 for the simple domains.

Split the check for irq_data == NULL out and have a separate warning
for it.

[ tglx: Made the check for irq_data == NULL separate ]

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: marc.zyngier@arm.com
Cc: thomas.abraham@linaro.org
Cc: jamie@jamieiles.com
Cc: b-cousson@ti.com
Cc: shawn.guo@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree-discuss@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1316017900-19918-3-git-send-email-robherring2@gmail.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 5bd078dd

kernel/irq/irqdomain.c

+5 −1

Original line number	Original line	Diff line number	Diff line
	@@ -29,7 +29,11 @@ void irq_domain_add(struct irq_domain *domain)
	*/		*/
	for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {		for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
	d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));		d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
	if (d \|\| d->domain) {		if (!d) {
			WARN(1, "error: assigning domain to non existant irq_desc");
			return;
			}
			if (d->domain) {
	/* things are broken; just report, don't clean up */		/* things are broken; just report, don't clean up */
	WARN(1, "error: irq_desc already assigned to a domain");		WARN(1, "error: irq_desc already assigned to a domain");
	return;		return;