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

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Date:   Tue, 11 Oct 2016 12:32:17 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Sebastian Reichel <sre@...nel.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>, robh@...nel.org,
        Jun Li <jun.li@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Ruslan Bilovol <ruslan.bilovol@...il.com>,
        Peter Chen <peter.chen@...escale.com>,
        Alan Stern <stern@...land.harvard.edu>, r.baldyga@...sung.com,
        grygorii.strashko@...com,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        patches@...nsource.wolfsonmicro.com,
        Linux PM list <linux-pm@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        device-mainlining@...ts.linuxfoundation.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v17 3/4] usb: gadget: Integrate with the usb gadget
 supporting for usb charger

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