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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Pan Bian <bianpan2016@163.com>,
        Alexandre Belloni <alexandre.belloni@free-electrons.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 003/167] rtc: snvs: fix an incorrect check of
 return value
Thread-Topic: [PATCH AUTOSEL for 4.4 003/167] rtc: snvs: fix an incorrect
 check of return value
Thread-Index: AQHTv5wV1bdeNFnhFkii50zgA5faGQ==
Date:   Mon, 19 Mar 2018 16:05:22 +0000
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From: Pan Bian <bianpan2016@163.com>

[ Upstream commit 758929005f06f954b7e1c87a1c9fdb44157b228f ]

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@163.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.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 950c5d0b6dca..afab89f5be48 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -257,7 +257,7 @@ static int snvs_rtc_probe(struct platform_device *pdev)
 		of_property_read_u32(pdev->dev.of_node, "offset", &data->offset);
 	}
=20
-	if (!data->regmap) {
+	if (IS_ERR(data->regmap)) {
 		dev_err(&pdev->dev, "Can't find snvs syscon\n");
 		return -ENODEV;
 	}
--=20
2.14.1