linux-kernel - Re: [EXT] [PATCH v3] USB: gadget: Add ID numbers to configfs-gadget driver names

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Message-ID: <4d63de84-f398-3bee-cf04-5cf9020b1cfd@amperemail.onmicrosoft.com>
Date:   Thu, 12 Jan 2023 15:38:23 +0700
From:   Chanh Nguyen <chanh@...eremail.onmicrosoft.com>
To:     Frank Li <frank.li@....com>,
        Chanh Nguyen <chanh@...amperecomputing.com>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Dan Vacura <w36195@...orola.com>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Vijayavardhan Vennapusa <vvreddy@...eaurora.org>,
        Rondreis <linhaoguo86@...il.com>,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Open Source Submission <patches@...erecomputing.com>
Subject: Re: [EXT] [PATCH v3] USB: gadget: Add ID numbers to configfs-gadget
 driver names



On 11/01/2023 22:16, Frank Li wrote:
> 
> 
>> -----Original Message-----
>> From: Chanh Nguyen <chanh@...amperecomputing.com>
>> Sent: Wednesday, January 11, 2023 12:51 AM
>> To: OpenBMC Maillist <openbmc@...ts.ozlabs.org>; Greg Kroah-Hartman
>> <gregkh@...uxfoundation.org>; Frank Li <frank.li@....com>; Christophe
>> JAILLET <christophe.jaillet@...adoo.fr>; Dan Vacura
>> <w36195@...orola.com>; Jakob Koschel <jakobkoschel@...il.com>; Alan
>> Stern <stern@...land.harvard.edu>; Vijayavardhan Vennapusa
>> <vvreddy@...eaurora.org>; Rondreis <linhaoguo86@...il.com>; Andrzej
>> Pietrasiewicz <andrzej.p@...labora.com>; Heikki Krogerus
>> <heikki.krogerus@...ux.intel.com>; linux-usb@...r.kernel.org; linux-
>> kernel@...r.kernel.org; Open Source Submission
>> <patches@...erecomputing.com>
>> Cc: Chanh Nguyen <chanh@...amperecomputing.com>
>> Subject: [EXT] [PATCH v3] USB: gadget: Add ID numbers to configfs-gadget
>> driver names
>>
>> Caution: EXT Email
>>
>> It is unable to use configfs to attach more than one gadget. When
>> attaching the second gadget, it always fails and the kernel message
>> prints out:
>>
>> Error: Driver 'configfs-gadget' is already registered, aborting...
>> UDC core: g1: driver registration failed: -16
>>
>> This commit fixes the problem by using the gadget name as a suffix
>> to each configfs_gadget's driver name, thus making the names
>> distinct.
>>
>> Fixes: fc274c1e9973 ("USB: gadget: Add a new bus for gadgets")
>> Signed-off-by: Chanh Nguyen <chanh@...amperecomputing.com>
> 
> Reviewed-by: Frank Li <frank.li@....com>
> 

Thanks Frank!

>>
>> ---
>> Changes in v3:
>>    - Use the gadget name as a unique suffix instead     [Andrzej]
>>    - Remove the driver.name allocation by template        [Chanh]
>>    - Update commit message                                [Chanh]
>>
>> Changes in v2:
>>    - Replace scnprintf() by kasprintf() to simplify the code [CJ]
>>    - Move the clean up code from gadgets_drop() to
>>      gadget_info_attr_release()                        [Frank Li]
>>    - Correct the resource free up in gadges_make()   [Alan Stern]
>>    - Remove the unnecessary variable in gadgets_make()    [Chanh]
>>    - Fixes minor grammar issue in commit message          [Chanh]
>> ---
>>   drivers/usb/gadget/configfs.c | 12 ++++++++++--
>>   1 file changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
>> index 96121d1c8df4..0853536cbf2e 100644
>> --- a/drivers/usb/gadget/configfs.c
>> +++ b/drivers/usb/gadget/configfs.c
>> @@ -393,6 +393,7 @@ static void gadget_info_attr_release(struct
>> config_item *item)
>>          WARN_ON(!list_empty(&gi->string_list));
>>          WARN_ON(!list_empty(&gi->available_func));
>>          kfree(gi->composite.gadget_driver.function);
>> +       kfree(gi->composite.gadget_driver.driver.name);
>>          kfree(gi);
>>   }
>>
>> @@ -1572,7 +1573,6 @@ static const struct usb_gadget_driver
>> configfs_driver_template = {
>>          .max_speed      = USB_SPEED_SUPER_PLUS,
>>          .driver = {
>>                  .owner          = THIS_MODULE,
>> -               .name           = "configfs-gadget",
>>          },
>>          .match_existing_only = 1,
>>   };
>> @@ -1623,13 +1623,21 @@ static struct config_group *gadgets_make(
>>
>>          gi->composite.gadget_driver = configfs_driver_template;
>>
>> +       gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
>> +                                                           "configfs-gadget.%s", name);
>> +       if (!gi->composite.gadget_driver.driver.name)
>> +               goto err;
>> +
>>          gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
>>          gi->composite.name = gi->composite.gadget_driver.function;
>>
>>          if (!gi->composite.gadget_driver.function)
>> -               goto err;
>> +               goto out_free_driver_name;
>>
>>          return &gi->group;
>> +
>> +out_free_driver_name:
>> +       kfree(gi->composite.gadget_driver.driver.name);
>>   err:
>>          kfree(gi);
>>          return ERR_PTR(-ENOMEM);
>> --
>> 2.17.1
>