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mfd: ab8500-core improved error handling in get_chip_id

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We check for dev before dereferencing it.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mattias Wallin 2010-12-02 15:08:32 +01:00 committed by Samuel Ortiz
parent ec9d0cf578
commit 6bce7bf1a1
1 changed files with 6 additions and 2 deletions
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8
drivers/mfd/ab8500-core.c
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@ -103,8 +103,12 @@ static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
static int ab8500_get_chip_id(struct device *dev) static int ab8500_get_chip_id(struct device *dev)
{ {
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent); struct ab8500 *ab8500;
return (int)ab8500->chip_id;
if (!dev)
return -EINVAL;
ab8500 = dev_get_drvdata(dev->parent);
return ab8500 ? (int)ab8500->chip_id : -EINVAL;
} }
static int set_register_interruptible(struct ab8500 *ab8500, u8 bank, static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,