Re: [PATCH] usb: common: usb-conn-gpio: use a unique names for usb connector devices

[Chance Yang <chance.yang@kneron.us>]

Greg Kroah-Hartman <gregkh@linuxfoundation.org> writes:

> On Fri, Apr 11, 2025 at 11:27:33AM +0800, Chance Yang wrote:
>> The current implementation uses "usb-charger" as a generic name for
>> usb connector. This prevents us to have two usb connector devices
>> attached as the power system will complain about the name which is
>> already registered.
>> 
>> Use an incremental name for each usb connector attached.
>> 
>> Fixes: 880287910b189 ("usb: common: usb-conn-gpio: fix NULL pointer dereference of charger")
>> Signed-off-by: Chance Yang <chance.yang@kneron.us>
>> ---
>> This patch addresses an issue in the usb-conn-gpio driver where the
>> generic "usb-charger" name is used for all USB connector devices. This
>> causes conflicts in the power supply subsystem when multiple USB
>> connectors are present, as duplicate names are not allowed.
>> 
>> The fix introduces an incremental naming scheme (e.g., usb-charger-0,
>> usb-charger-1) for each USB connector device, ensuring uniqueness and
>> preventing registration errors.
>> ---
>>  drivers/usb/common/usb-conn-gpio.c | 8 +++++++-
>>  1 file changed, 7 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
>> index 1e36be2a28fd5ca5e1495b7923e4d3e25d7cedef..2702e1a26634770500febd567f9d0891e63a8c4c 100644
>> --- a/drivers/usb/common/usb-conn-gpio.c
>> +++ b/drivers/usb/common/usb-conn-gpio.c
>> @@ -155,13 +155,19 @@ static int usb_charger_get_property(struct power_supply *psy,
>>  
>>  static int usb_conn_psy_register(struct usb_conn_info *info)
>>  {
>> +	static atomic_t usb_conn_no = ATOMIC_INIT(0);
>
> Please use a proper data structure for this (hint, not an atomic_t, but
> rather a idr, or is it ida?)
>
> thanks,
>
> greg k-h

Thanks for the feedback !

I will use ida to genrate unique name (e.g., usb-charger-0,
usb-charger-1) and send v2 version of this patch.


-- 
Sincerely,
Chance Yang