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: 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>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/cpcap-adc.c b/drivers/iio/adc/cpcap-adc.c
index 3576ec7..9ad6042 100644 (file)
--- a/drivers/iio/adc/cpcap-adc.c
+++ b/drivers/iio/adc/cpcap-adc.c
@@ -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,