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    Subject[PATCH 4.14 023/228] i2c: slave: add sanity check when unregistering
    Date
    From: Wolfram Sang <wsa+renesas@sang-engineering.com>

    [ Upstream commit 8808981baf96e1b3dea1f08461e4d958aa0dbde1 ]

    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 | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/i2c/i2c-core-slave.c b/drivers/i2c/i2c-core-slave.c
    index 21051aba39e3a..d89bc31e06227 100644
    --- a/drivers/i2c/i2c-core-slave.c
    +++ b/drivers/i2c/i2c-core-slave.c
    @@ -62,6 +62,9 @@ int i2c_slave_unregister(struct i2c_client *client)
    {
    int ret;

    + if (IS_ERR_OR_NULL(client))
    + return -EINVAL;
    +
    if (!client->adapter->algo->unreg_slave) {
    dev_err(&client->dev, "%s: not supported by adapter\n", __func__);
    return -EOPNOTSUPP;
    --
    2.25.1


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