linux-kernel - [PATCH] mailbox: arm_mhuv2: Fix return value check in mhuv2

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Message-ID: <20221125063549.2546364-1-yangyingliang@huawei.com>
Date:   Fri, 25 Nov 2022 14:35:48 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <viresh.kumar@...aro.org>, <Tushar.Khandelwal@....com>,
        <jassisinghbrar@...il.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH] mailbox: arm_mhuv2: Fix return value check in mhuv2_probe()

If devm_of_iomap() fails, it returns ERR_PTR() and never
return NULL, so replace NULL pointer check with IS_ERR()
to fix this problem.

Fixes: 5a6338cce9f4 ("mailbox: arm_mhuv2: Add driver")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/mailbox/arm_mhuv2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mailbox/arm_mhuv2.c b/drivers/mailbox/arm_mhuv2.c
index a47aef8df52f..c6d4957c4da8 100644
--- a/drivers/mailbox/arm_mhuv2.c
+++ b/drivers/mailbox/arm_mhuv2.c
@@ -1062,8 +1062,8 @@ static int mhuv2_probe(struct amba_device *adev, const struct amba_id *id)
 	int ret = -EINVAL;
 
 	reg = devm_of_iomap(dev, dev->of_node, 0, NULL);
-	if (!reg)
-		return -ENOMEM;
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
 
 	mhu = devm_kzalloc(dev, sizeof(*mhu), GFP_KERNEL);
 	if (!mhu)
-- 
2.25.1