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omap: Ptr "isr_reg" tracked as NULL was dereferenced

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Value of "isr_reg" pointer is depend on configuration and GPIO method.
Potentially it may have NULL value and it is dereferenced later
in code. Warning and exit from function are added in this case.

Signed-off-by: Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Evgeny Kuznetsov 2010-12-07 16:25:40 -08:00 committed by Tony Lindgren
parent be40f7a3d7
commit b1cc4c55c6
1 changed files with 5 additions and 0 deletions
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5
arch/arm/plat-omap/gpio.c
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@ -1318,6 +1318,10 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
if (bank->method == METHOD_GPIO_44XX)
isr_reg = bank->base + OMAP4_GPIO_IRQSTATUS0;
#endif
if (WARN_ON(!isr_reg))
goto exit;
while(1) {
u32 isr_saved, level_mask = 0;
u32 enabled;
@ -1377,6 +1381,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
configured, we must unmask the bank interrupt only after
handler(s) are executed in order to avoid spurious bank
interrupt */
exit:
if (!unmasked)
desc->chip->unmask(irq);