Re: [PATCH v17 3/4] usb: gadget: Integrate with the usb gadget supporting for usb charger

[Lu Baolu <baolu.lu@linux.intel.com>]

Hi,

On 10/11/2016 12:07 PM, Baolin Wang wrote:
>>>  /*
>>> >> + * usb_charger_unregister() - Unregister a usb charger.
>>> >> + * @uchger - the usb charger to be unregistered.
>>> >> + */
>>> >> +static int usb_charger_unregister(struct usb_charger *uchger)
>>> >> +{
>>> >> +     ida_simple_remove(&usb_charger_ida, uchger->id);
>>> >> +     sysfs_remove_groups(&uchger->gadget->dev.kobj, usb_charger_groups);
>>> >> +
>>> >> +     mutex_lock(&charger_lock);
>>> >> +     list_del(&uchger->list);
>>> >> +     mutex_unlock(&charger_lock);
>>> >> +
>>> >> +     kfree(uchger);
>> >
>> > Any reasons you want to put kfree() here? You allocated the memory
>> > in usb_charger_init(). Isn't usb_charger_exit() a better place?
> The usb_charger_exit() will issue usb_charger_unregister() and we need
> use the usb_charger structure in usb_charger_unregister() to
> unregister the usb charger.
>

This seems not to be a strong reason. :-)

You can unregister the charger first and then free the structure.
Just do the reverse operation of what you have done in the init
function.

Best regards,
Lu Baolu