From: Wei Yongjun <weiyongjun1@huawei.com> stable inclusion from stable-5.10.52 commit 5577eece796fe47a4c8aa42422149aab296cf9c0 bugzilla: 175542 https://gitee.com/openeuler/kernel/issues/I4DTKU Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ 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@huawei.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20210304045909.945799-1-weiyongjun1@huawei.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- 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); -- 2.20.1