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gpio: mpc8xxx: Prevent NULL pointer deref in demux handler

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commit cfadd838(powerpc/8xxx: Fix interrupt handling in MPC8xxx GPIO
driver) added an unconditional call of chip->irq_eoi() to the demux
handler.

This leads to a NULL pointer derefernce on MPC512x platforms which use
this driver as well.

Make it conditional.

Reported-by: Thomas Wucher <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Felix Radensky <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: [email protected]
Signed-off-by: Grant Likely <[email protected]>
This commit is contained in:
Thomas Gleixner 2012-05-03 12:22:06 +02:00 • committed by Grant Likely
commit d6de85e85e
1 changed files with 2 additions and 1 deletions
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3
drivers/gpio/gpio-mpc8xxx.c
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@ -163,7 +163,8 @@ static void mpc8xxx_gpio_irq_cascade(unsigned int irq, struct irq_desc *desc)
if (mask)
generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
32 - ffs(mask)));
chip->irq_eoi(&desc->irq_data);
if (chip->irq_eoi)
chip->irq_eoi(&desc->irq_data);
}
static void mpc8xxx_irq_unmask(struct irq_data *d)