linux-kernel - Re: [PATCH] usb: gadget: f_ncm: fix wrong usb

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Message-ID: <20191125042039.GA10953@b29397-desktop>
Date:   Mon, 25 Nov 2019 04:20:42 +0000
From:   Peter Chen <peter.chen@....com>
To:     Henry Lin <henryl@...dia.com>
CC:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Romain Izard <romain.izard.pro@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: gadget: f_ncm: fix wrong usb_ep

On 19-11-21 12:18:57, Henry Lin wrote:
> Gadget driver should always use config_ep_by_speed() to initialize
> usb_ep struct according to usb device's operating speed. Otherwise,
> usb_ep struct may be wrong if usb devcie's operating speed is changed.
> 

Would you please share the use case how to reproduce it?

Peter
> Signed-off-by: Henry Lin <henryl@...dia.com>
> ---
>  drivers/usb/gadget/function/f_ncm.c | 28 ++++++++++++----------------
>  1 file changed, 12 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c
> index 2d6e76e4cffa..420b9c96f2fe 100644
> --- a/drivers/usb/gadget/function/f_ncm.c
> +++ b/drivers/usb/gadget/function/f_ncm.c
> @@ -870,11 +870,10 @@ static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>  		DBG(cdev, "reset ncm control %d\n", intf);
>  		usb_ep_disable(ncm->notify);
>  
> -		if (!(ncm->notify->desc)) {
> -			DBG(cdev, "init ncm ctrl %d\n", intf);
> -			if (config_ep_by_speed(cdev->gadget, f, ncm->notify))
> -				goto fail;
> -		}
> +		DBG(cdev, "init ncm ctrl %d\n", intf);
> +		if (config_ep_by_speed(cdev->gadget, f, ncm->notify))
> +			goto fail;
> +
>  		usb_ep_enable(ncm->notify);
>  
>  	/* Data interface has two altsettings, 0 and 1 */
> @@ -897,17 +896,14 @@ static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>  		if (alt == 1) {
>  			struct net_device	*net;
>  
> -			if (!ncm->port.in_ep->desc ||
> -			    !ncm->port.out_ep->desc) {
> -				DBG(cdev, "init ncm\n");
> -				if (config_ep_by_speed(cdev->gadget, f,
> -						       ncm->port.in_ep) ||
> -				    config_ep_by_speed(cdev->gadget, f,
> -						       ncm->port.out_ep)) {
> -					ncm->port.in_ep->desc = NULL;
> -					ncm->port.out_ep->desc = NULL;
> -					goto fail;
> -				}
> +			DBG(cdev, "init ncm\n");
> +			if (config_ep_by_speed(cdev->gadget, f,
> +					       ncm->port.in_ep) ||
> +			    config_ep_by_speed(cdev->gadget, f,
> +					       ncm->port.out_ep)) {
> +				ncm->port.in_ep->desc = NULL;
> +				ncm->port.out_ep->desc = NULL;
> +				goto fail;
>  			}
>  
>  			/* TODO */
> -- 
> 2.17.1
> 

-- 

Thanks,
Peter Chen