iio: adc: cpcap: fix incorrect validation

commit 81b039ec36a41a5451e1e36f05bb055eceab1dc8 upstream.

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: 25ec249632d50 ("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>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/adc/cpcap-adc.c b/drivers/iio/adc/cpcap-adc.c
index 6e419d5..f153e02 100644 (file)
--- a/drivers/iio/adc/cpcap-adc.c
+++ b/drivers/iio/adc/cpcap-adc.c
@@ -1012,7 +1012,7 @@ 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,