linux-kernel - Re: [PATCH] usb: gadget: f_sourcesink: Fix isoc transfer for USB_SPEED_SUPER

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Date:   Fri, 21 Jan 2022 10:09:00 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Pavankumar Kondeti <quic_pkondeti@...cinc.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: f_sourcesink: Fix isoc transfer for
 USB_SPEED_SUPER_PLUS

On Fri, Jan 21, 2022 at 05:01:24PM +0530, Pavankumar Kondeti wrote:
> Currently when gadget enumerates in super speed plus, the isoc
> endpoint request buffer size is not calculated correctly. Fix
> this by checking the gadget speed against USB_SPEED_SUPER_PLUS
> and update the request buffer size.
> 
> Signed-off-by: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
> ---
>  drivers/usb/gadget/function/f_sourcesink.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/gadget/function/f_sourcesink.c b/drivers/usb/gadget/function/f_sourcesink.c
> index 1abf08e..0a423ba 100644
> --- a/drivers/usb/gadget/function/f_sourcesink.c
> +++ b/drivers/usb/gadget/function/f_sourcesink.c
> @@ -584,6 +584,8 @@ static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
>  
>  	if (is_iso) {
>  		switch (speed) {
> +		case USB_SPEED_SUPER_PLUS:
> +			fallthrough;

There's no need for this "fallthough" line.  You're allowed to have 
multiple case labels for a single block of code.

Alan Stern

>  		case USB_SPEED_SUPER:
>  			size = ss->isoc_maxpacket *
>  					(ss->isoc_mult + 1) *
> -- 
> 2.7.4
>