linux-kernel - [PATCH 1/1] rtc: snvs: fix an incorrect check of return value

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Date:   Sun, 23 Apr 2017 13:43:24 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/1] rtc: snvs: fix an incorrect check of return value

Function devm_regmap_init_mmio() returns an ERR_PTR on error. However,
in function snvs_rtc_probe() its return value is checked against NULL.
This patch fixes it by checking the return value with IS_ERR().

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/rtc/rtc-snvs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index d51b07d..d8ef9e0 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -258,7 +258,7 @@ static int snvs_rtc_probe(struct platform_device *pdev)
 		of_property_read_u32(pdev->dev.of_node, "offset", &data->offset);
 	}
 
-	if (!data->regmap) {
+	if (IS_ERR(data->regmap)) {
 		dev_err(&pdev->dev, "Can't find snvs syscon\n");
 		return -ENODEV;
 	}
-- 
1.9.1