linux-kernel - Re: [PATCH] USB: Remove dead code in usb_choose

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Date:   Thu, 7 May 2020 09:32:25 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Jason Yan <yanaijie@...wei.com>
cc:     gregkh@...uxfoundation.org, <hadess@...ess.net>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: Remove dead code in usb_choose_configuration()

On Thu, 7 May 2020, Jason Yan wrote:

> This code is dead for more than 10 years. Remove it.
> 
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> ---
>  drivers/usb/core/generic.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/usb/core/generic.c b/drivers/usb/core/generic.c
> index 4626227a6dd2..1c93192fc136 100644
> --- a/drivers/usb/core/generic.c
> +++ b/drivers/usb/core/generic.c
> @@ -93,12 +93,6 @@ int usb_choose_configuration(struct usb_device *udev)
>  		 * be reinstated when device firmwares become more reliable.
>  		 * Don't hold your breath.
>  		 */
> -#if 0
> -		/* Rule out self-powered configs for a bus-powered device */
> -		if (bus_powered && (c->desc.bmAttributes &
> -					USB_CONFIG_ATT_SELFPOWER))
> -			continue;
> -#endif

Please don't remove this dead code.  But if you insist on removing it
then you should make it part of the preceding comment -- otherwise
people reading the comment won't know what it's talking about.

And I really think removing both the code and the comment would be a 
bad idea.  If you do that, someday somebody will think that the code is 
missing by accident and will add it in, causing problems for many other 
people.

Alan Stern