From 81b039ec36a41a5451e1e36f05bb055eceab1dc8 Mon Sep 17 00:00:00 2001
From: Pan Bian <bianpan2016@163.com>
Date: Mon, 13 Nov 2017 00:01:20 +0800
Subject: [PATCH] iio: adc: cpcap: fix incorrect validation
Git-commit: 81b039ec36a41a5451e1e36f05bb055eceab1dc8
Patch-mainline: v4.15-rc3
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/iio/adc/cpcap-adc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iio/adc/cpcap-adc.c
+++ b/drivers/iio/adc/cpcap-adc.c
@@ -968,7 +968,7 @@ static int cpcap_adc_probe(struct platfo
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,