linux-kernel - Re: [PATCH 3/3] ARM: gic: add OF based initialization

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Date:	Wed, 21 Sep 2011 12:55:59 -0500
From:	Rob Herring <robherring2@...il.com>
To:	"Cousson, Benoit" <b-cousson@...com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"thomas.abraham@...aro.org" <thomas.abraham@...aro.org>,
	"jamie@...ieiles.com" <jamie@...ieiles.com>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"dave.martin@...aro.org" <dave.martin@...aro.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH 3/3] ARM: gic: add OF based initialization

Benoit,

On 09/21/2011 12:15 PM, Cousson, Benoit wrote:
> Hi Rob,
> 
> I'm testing that series with OMAP4 but have some issues for the moment :-(
> 
> [    0.000000] WARNING: at kernel/irq/irqdomain.c:34 gic_of_init+0x10c/0x180()
> [    0.000000] error: irq_desc already assigned to a domain
> [    0.000000] Modules linked in:
> [    0.000000] [<c001b284>] (unwind_backtrace+0x0/0xf0) from [<c0051c34>] (warn_slowpath_common+0x4c/0x64)
> [    0.000000] [<c0051c34>] (warn_slowpath_common+0x4c/0x64) from [<c0051ce0>] (warn_slowpath_fmt+0x30/0x40)
> [    0.000000] [<c0051ce0>] (warn_slowpath_fmt+0x30/0x40) from [<c05f6874>] (gic_of_init+0x10c/0x180)
> [    0.000000] [<c05f6874>] (gic_of_init+0x10c/0x180) from [<c05fa2e0>] (omap_gic_of_init+0x8/0x28)
> [    0.000000] [<c05fa2e0>] (omap_gic_of_init+0x8/0x28) from [<c0616b44>] (of_irq_init+0x148/0x28c)
> [    0.000000] [<c0616b44>] (of_irq_init+0x148/0x28c) from [<c05f3074>] (init_IRQ+0x14/0x1c)
> [    0.000000] [<c05f3074>] (init_IRQ+0x14/0x1c) from [<c05f0650>] (start_kernel+0x184/0x2fc)
> [    0.000000] [<c05f0650>] (start_kernel+0x184/0x2fc) from [<80008040>] (0x80008040)
>  
> I'm not super familiar with all the irq stuff but I'm wondering if there is not something wrong with the test that print that message:
> 
> void irq_domain_add(struct irq_domain *domain)
> {
> 	struct irq_data *d;
> 	int hwirq;
> 
> 	/*
> 	 * This assumes that the irq_domain owner has already allocated
> 	 * the irq_descs.  This block will be removed when support for dynamic
> 	 * allocation of irq_descs is added to irq_domain.
> 	 */
> 	for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
> 		d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
> 		if (d || d->domain) {
> 			/* things are broken; just report, don't clean up */
> 			WARN(1, "error: irq_desc already assigned to a domain");
> 			return;
> 		}
> [...]
> 
> Is the (d || d->domain) correct? Shouldn't it be (d && d->domain)?
> 
> But since that used to work properly, I have some doubt. Moreover the driver will not even get the proper interrupt later...
> 
> Do you have any clue?

I fixed that in the prior series and tglx picked it up, so I did not
repost. It should hit mainline for 3.1, but I haven't verified if it is
in yet. Sorry for the confusion, I should have mentioned that.

Rob

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