linux-kernel - [PATCH 5.12 196/292] watchdog: jz4740: Fix return value check in jz4740_wdt

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Date:   Mon, 19 Jul 2021 16:54:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 196/292] watchdog: jz4740: Fix return value check in jz4740_wdt_probe()

From: Wei Yongjun <weiyongjun1@...wei.com>

[ Upstream commit 29e85f53fb58b45b9e9276dcdf1f1cb762dd1c9f ]

In case of error, the function device_node_to_regmap() returns
ERR_PTR() and never returns NULL. The NULL test in the return
value check should be replaced with IS_ERR().

Fixes: 6d532143c915 ("watchdog: jz4740: Use regmap provided by TCU driver")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
Acked-by: Paul Cercueil <paul@...pouillou.net>
Link: https://lore.kernel.org/r/20210304045909.945799-1-weiyongjun1@huawei.com
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@...ux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/watchdog/jz4740_wdt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
index bdf9564efa29..395bde79e292 100644
--- a/drivers/watchdog/jz4740_wdt.c
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -176,9 +176,9 @@ static int jz4740_wdt_probe(struct platform_device *pdev)
 	watchdog_set_drvdata(jz4740_wdt, drvdata);
 
 	drvdata->map = device_node_to_regmap(dev->parent->of_node);
-	if (!drvdata->map) {
+	if (IS_ERR(drvdata->map)) {
 		dev_err(dev, "regmap not found\n");
-		return -EINVAL;
+		return PTR_ERR(drvdata->map);
 	}
 
 	return devm_watchdog_register_device(dev, &drvdata->wdt);
-- 
2.30.2