linux-kernel - Re: [PATCH] USB: gadget: Fix the function name error in sourcesink/loopback.

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Date:   Tue, 1 Aug 2023 07:06:23 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     zhouscd <zhouscd@...il.com>
Cc:     dan.scally@...asonboard.com, laurent.pinchart@...asonboard.com,
        m.grzeschik@...gutronix.de, john@...ping.me.uk,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: gadget: Fix the function name error in
 sourcesink/loopback.

On Mon, Jul 31, 2023 at 09:54:49PM -0700, zhouscd wrote:
> Inconsistent function names can cause the USB config FS not work.

I do not understand this text at all, sorry.

What exactly is broken and what is changed here to resolve the issue?

> 
> Signed-off-by: zhouscd <zhouscd@...il.com>

What commit caused the problem?

And please use your full name for patches.

> ---
>  drivers/usb/gadget/function/f_loopback.c   | 13 +----------
>  drivers/usb/gadget/function/f_sourcesink.c | 25 ++--------------------
>  drivers/usb/gadget/function/g_zero.h       |  3 ---
>  3 files changed, 3 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_loopback.c b/drivers/usb/gadget/function/f_loopback.c
> index ae41f556eb75..45f542b5ff55 100644
> --- a/drivers/usb/gadget/function/f_loopback.c
> +++ b/drivers/usb/gadget/function/f_loopback.c
> @@ -583,16 +583,5 @@ static struct usb_function_instance *loopback_alloc_instance(void)
>  
>  	return  &lb_opts->func_inst;
>  }
> -DECLARE_USB_FUNCTION(Loopback, loopback_alloc_instance, loopback_alloc);
> -
> -int __init lb_modinit(void)
> -{
> -	return usb_function_register(&Loopbackusb_func);
> -}
> -
> -void __exit lb_modexit(void)
> -{
> -	usb_function_unregister(&Loopbackusb_func);
> -}
> -
> +DECLARE_USB_FUNCTION_INIT(loopback, loopback_alloc_instance, loopback_alloc);
>  MODULE_LICENSE("GPL");
> diff --git a/drivers/usb/gadget/function/f_sourcesink.c b/drivers/usb/gadget/function/f_sourcesink.c
> index 6803cd60cc6d..f6d1c095aa2c 100644
> --- a/drivers/usb/gadget/function/f_sourcesink.c
> +++ b/drivers/usb/gadget/function/f_sourcesink.c
> @@ -858,7 +858,7 @@ static struct usb_function *source_sink_alloc_func(
>  	ss->bulk_qlen = ss_opts->bulk_qlen;
>  	ss->iso_qlen = ss_opts->iso_qlen;
>  
> -	ss->function.name = "source/sink";
> +	ss->function.name = "sourcesink";

You just changed a user-visable api, right?  Where did you document this
and what will it affect?

thanks,

greg k-h