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staging:iio:lpc32xx_adc: Fix IRQ check 

The test in the lpc32xx_adc driver which checks whether the IRQ number returned
by platform_get_irq() has multiple problems. It accepts 0 even though this is an
invalid IRQ. It also rejects IRQ numbers that are larger or equal than NR_IRQS.
First of all drivers should never need to reference NR_IRQS and secondly with
CONFIG_SPARSE_IRQ NR_IRQS is not the upper limit, so the check might reject
valid IRQ numbers. This patch modifies the check to only test against less or
equal to 0.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: Roland Stigge <stigge@antcom.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2013-10-16 21:45:00 +01:00 committed by Jonathan Cameron
parent bf741c08af
commit 2918ad14cc
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/iio/adc/lpc32xx_adc.c
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@ -160,7 +160,7 @@ static int lpc32xx_adc_probe(struct platform_device *pdev)
}
irq = platform_get_irq(pdev, 0);
if ((irq < 0) || (irq >= NR_IRQS)) {
if (irq <= 0) {
dev_err(&pdev->dev, "failed getting interrupt resource\n");
return -EINVAL;
}