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i2c: slave: improve sanity check when registering 

[ 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>
This commit is contained in:
Wolfram Sang 2020-07-25 21:50:52 +02:00 committed by Greg Kroah-Hartman
parent 4bba72b72c
commit fa0195d83a
1 changed files with 1 additions and 3 deletions
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4
drivers/i2c/i2c-core-slave.c
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@ -18,10 +18,8 @@ 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",