linux-kernel - [PATCH2] CNS3xxx: Fix a WARN() related to IRQ allocation.

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Date:	Tue, 04 Mar 2014 11:37:20 +0100
From:	khalasa@...p.pl (Krzysztof Hałasa)
To:	linux-arm-kernel@...ts.infradead.org
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Anton Vorontsov <anton@...msg.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH2] CNS3xxx: Fix a WARN() related to IRQ allocation.

WARNING: at drivers/irqchip/irq-gic.c:952 gic_init_bases+0xe4/0x2b8()
Cannot allocate irq_descs @ IRQ16, assuming pre-allocated
Backtrace:
gic_init_bases    from cns3xxx_init_irq+0x24/0x34
cns3xxx_init_irq  from init_IRQ+0x24/0x2c
init_IRQ          from start_kernel+0x1a8/0x338
start_kernel      from 0x2000806c

The problem is that 64 CNS3xxx CPU interrupts, starting at 32, are
allocated by the ARM platform-independent code (as requested by
machine_desc->nr_irqs = 96), and then the GIC code tries to allocate
them again.

Tested on Gateworks Laguna board, masqueraded as CNS3420VB.

Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>
-- 
Krzysztof Halasa

Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland
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