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ARM: davinci: Check for NULL return from irq_alloc_generic_chip 

Avoid NULL dereference of irq_alloc_generic_chip return in low
memory conditions.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Todd Poynor 2011-07-16 22:39:35 -07:00 committed by Sekhar Nori
parent f299bb9527
commit 33e1e5e317
1 changed files with 6 additions and 0 deletions
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6
arch/arm/mach-davinci/irq.c
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@ -52,6 +52,12 @@ davinci_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
struct irq_chip_type *ct;
gc = irq_alloc_generic_chip("AINTC", 1, irq_start, base, handle_edge_irq);
if (!gc) {
pr_err("%s: irq_alloc_generic_chip for IRQ %u failed\n",
__func__, irq_start);
return;
}
ct = gc->chip_types;
ct->chip.irq_ack = irq_gc_ack;
ct->chip.irq_mask = irq_gc_mask_clr_bit;