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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Wolfram Sang <wsa+renesas@sang-engineering.com>,
        Alain Volmat <alain.volmat@st.com>,
        Wolfram Sang <wsa@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 22/48] i2c: slave: improve sanity check when registering
Date:   Mon, 10 Aug 2020 17:21:44 +0200
Message-Id: <20200810151805.310493685@linuxfoundation.org>
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From: Wolfram Sang <wsa+renesas@sang-engineering.com>

[ Upstream commit 1b1be3bf27b62f5abcf85c6f3214bdb9c7526685 ]

Add check for ERR_PTR and simplify code while here.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/i2c/i2c-core-slave.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/i2c/i2c-core-slave.c b/drivers/i2c/i2c-core-slave.c
index 47a9f70a24a97..88959c8580ce0 100644
--- a/drivers/i2c/i2c-core-slave.c
+++ b/drivers/i2c/i2c-core-slave.c
@@ -22,10 +22,8 @@ int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb)
 {
 	int ret;
 
-	if (!client || !slave_cb) {
-		WARN(1, "insufficient data\n");
+	if (WARN(IS_ERR_OR_NULL(client) || !slave_cb, "insufficient data\n"))
 		return -EINVAL;
-	}
 
 	if (!(client->flags & I2C_CLIENT_SLAVE))
 		dev_warn(&client->dev, "%s: client slave flag not set. You might see address collisions\n",
-- 
2.25.1