At 2022-07-21 17:20:56, "Peter Rosin" <peda@xxxxxxxxxx> wrote:
>Hi!
>
>2022-07-21 at 10:12, Liang He wrote:
>> In i2c_mux_probe(), we should call of_node_put() when breaking out
>> of for_each_child_of_node() which will automatically increase and
>> decrease the refcount.
>>
>> Fixes: ac8498f0ce53 ("i2c: i2c-mux-gpmux: new driver")
>> Signed-off-by: Liang He <windhl@xxxxxxx>
>> ---
>> drivers/i2c/muxes/i2c-mux-gpmux.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/i2c/muxes/i2c-mux-gpmux.c b/drivers/i2c/muxes/i2c-mux-gpmux.c
>> index d3acd8d66c32..30ab2fe88c8d 100644
>> --- a/drivers/i2c/muxes/i2c-mux-gpmux.c
>> +++ b/drivers/i2c/muxes/i2c-mux-gpmux.c
>> @@ -115,6 +115,7 @@ static int i2c_mux_probe(struct platform_device *pdev)
>> if (ret < 0) {
>> dev_err(dev, "no reg property for node '%pOFn'\n",
>> child);
>> + of_node_put(child);
>> goto err_children;
>> }
>>
>
>Right, but this is obviously incomplete. What about the other two branches
>in that loop that breaks out?
>
>Much better to have the missing of_node_put(child) statement below the
>err_children: label (i.e. before i2c_mux_del_adapters) so that it is not
>forgotten in any code flow. child cannot be uninitialized at that point
>and if it happens to be NULL, of_node_put will be a nop. So that's safe.
>
>Cheers,
>Peter
Thanks, Peter,
I have forgotten add of_node_put() in other fail path.
But your advice is better, I will send a new version soon!
Thanks again,
Liang
