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iio: adc: cpcap: fix incorrect validation 

Function platform_get_irq_byname() returns a negative error code on
failure, and a zero or positive number on success. However, in function
cpcap_adc_probe(), positive IRQ numbers are also taken as error cases.
Use "if (ddata->irq < 0)" instead of "if (!ddata->irq)" to validate the
return value of platform_get_irq_byname().

Signed-off-by: Pan Bian <bianpan2016@163.com>
Fixes: 25ec249632 ("iio: adc: cpcap: Add minimal support for CPCAP PMIC ADC")
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Tony Lindgren <tony@atomide.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Pan Bian 2017-11-13 00:01:20 +08:00 committed by Jonathan Cameron
parent 0590cdfead
commit 81b039ec36
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/adc/cpcap-adc.c
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@ -1011,7 +1011,7 @@ static int cpcap_adc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, indio_dev);
ddata->irq = platform_get_irq_byname(pdev, "adcdone");
if (!ddata->irq)
if (ddata->irq < 0)
return -ENODEV;
error = devm_request_threaded_irq(&pdev->dev, ddata->irq, NULL,