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i2c: slave: add sanity check when unregistering 

[ Upstream commit 8808981baf ]

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 21:50:53 +02:00 committed by Greg Kroah-Hartman
parent fa0195d83a
commit 871b5a5a3b
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/i2c-core-slave.c
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@ -58,6 +58,9 @@ int i2c_slave_unregister(struct i2c_client *client)
{ {
int ret; int ret;
if (IS_ERR_OR_NULL(client))
return -EINVAL;
if (!client->adapter->algo->unreg_slave) { if (!client->adapter->algo->unreg_slave) {
dev_err(&client->dev, "%s: not supported by adapter\n", __func__); dev_err(&client->dev, "%s: not supported by adapter\n", __func__);
return -EOPNOTSUPP; return -EOPNOTSUPP;