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

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Date:   Wed, 14 Dec 2022 10:24:37 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Chanh Nguyen <chanh@...eremail.onmicrosoft.com>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Chanh Nguyen <chanh@...amperecomputing.com>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Vacura <w36195@...orola.com>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Vijayavardhan Vennapusa <vvreddy@...eaurora.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Open Source Submission <patches@...erecomputing.com>,
        Frank Li <Frank.Li@....com>, Rondreis <linhaoguo86@...il.com>
Subject: Re: [PATCH] USB: gadget: Add ID numbers to configfs-gadget driver
 names

On Wed, Dec 14, 2022 at 11:15:48AM +0700, Chanh Nguyen wrote:

> Thanks CJ for the review!
> 
> I've made some changes as below (in gadgets_make() to remove unnecessary
> variables) and now trying to test it as much as possible. Will re-post it as
> v2 if looks good soon.
> 
> static inline struct gadget_info *to_gadget_info(struct config_item *item)
> @@ -1623,13 +1629,25 @@ static struct config_group *gadgets_make(
> 
>      gi->composite.gadget_driver = configfs_driver_template;
> 
> +    gi->driver_id_number = ida_alloc(&driver_id_numbers, GFP_KERNEL);
> +    if (gi->driver_id_number < 0)
> +        goto err;
> +
> +    gi->composite.gadget_driver.driver.name =
> +                          kasprintf(GFP_KERNEL, "configfs-gadget.%d",
> +                                    gi->driver_id_number);
> +    if (!gi->composite.gadget_driver.driver.name)
> +        goto out_free_driver_id_number;
> +
>      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_id_number;

This should goto out_free_driver_name.

Alan Stern

> 
>      return &gi->group;
> +
> +out_free_driver_id_number:
> +    ida_free(&driver_id_numbers, gi->driver_id_number);
>  err:
>      kfree(gi);
>      return ERR_PTR(-ENOMEM);