linux-kernel - Re: [PATCHv3 1/5] usb: gadget: bind UDC by name passed via usb_gadget

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Date:	Wed, 11 Mar 2015 02:24:14 +0200
From:	Ruslan Bilovol <ruslan.bilovol@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	"Balbi, Felipe" <balbi@...com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Krzysztof Opasiak <k.opasiak@...sung.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Peter Chen <peter.chen@...escale.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Subject: Re: [PATCHv3 1/5] usb: gadget: bind UDC by name passed via
 usb_gadget_driver structure

Hi Sergei,

On Wed, Feb 18, 2015 at 2:05 PM, Sergei Shtylyov
<sergei.shtylyov@...entembedded.com> wrote:
> Hello.
>
> On 2/18/2015 12:17 AM, Ruslan Bilovol wrote:
>
>> Introduce new 'udc_name' member to usb_gadget_driver structure.
>> The 'udc_name' is a name of UDC that usb_gadget_driver should
>> be bound to. If udc_name is NULL, it will be bound to any
>> available UDC.
>
>
>> Signed-off-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
>> ---
>>   drivers/usb/gadget/udc/udc-core.c | 25 ++++++++++++++++++++-----
>>   include/linux/usb/gadget.h        |  4 ++++
>>   2 files changed, 24 insertions(+), 5 deletions(-)
>
>
>> diff --git a/drivers/usb/gadget/udc/udc-core.c
>> b/drivers/usb/gadget/udc/udc-core.c
>> index 5a81cb0..e1079e08 100644
>> --- a/drivers/usb/gadget/udc/udc-core.c
>> +++ b/drivers/usb/gadget/udc/udc-core.c
>> @@ -440,21 +440,36 @@ EXPORT_SYMBOL_GPL(usb_udc_attach_driver);
>>   int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
>>   {
>>         struct usb_udc          *udc = NULL;
>> -       int                     ret;
>> +       int                     ret = -ENODEV;
>>
>>         if (!driver || !driver->bind || !driver->setup)
>>                 return -EINVAL;
>>
>>         mutex_lock(&udc_lock);
>> -       list_for_each_entry(udc, &udc_list, list) {
>> -               /* For now we take the first one */
>> -               if (!udc->driver)
>> +       if (driver->udc_name) {
>> +               list_for_each_entry(udc, &udc_list, list) {
>> +                       ret = strcmp(driver->udc_name,
>> dev_name(&udc->dev));
>> +                       if (!ret)
>> +                               break;
>> +               }
>> +               if (ret)
>> +                       ret = -ENODEV;
>> +               else if (udc->driver)
>> +                       ret = -EBUSY;
>> +               else
>>                         goto found;
>> +       } else {
>> +               list_for_each_entry(udc, &udc_list, list) {
>> +                       /* For now we take the first one */
>> +                       if (!udc->driver)
>> +                               goto found;
>> +               }
>> +               ret = -ENODEV;
>
>
>    Already assigned the same value by the initializer.

Thanks for pointing to this, will be fixed in next patch version

>
>>         }
>>
>>         pr_debug("couldn't find an available UDC\n");
>>         mutex_unlock(&udc_lock);
>> -       return -ENODEV;
>> +       return ret;
>>   found:
>>         ret = udc_bind_to_driver(udc, driver);
>>         mutex_unlock(&udc_lock);
>
> [...]
>
> WBR, Sergei
>


Best regards,
Ruslan
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