linux-kernel - Re: [PATCH v2 2/2] usb: cdns3: fix incorrect calculation of ep_buf

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Date:   Mon, 10 Jul 2023 11:38:34 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     Thinh.Nguyen@...opsys.com, andriy.shevchenko@...ux.intel.com,
        gregkh@...uxfoundation.org, imx@...ts.linux.dev, jgilab@...il.com,
        jun.li@....com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, quic_eserrao@...cinc.com,
        quic_prashk@...cinc.com, r-gunasekaran@...com, rogerq@...nel.org
Subject: Re: [PATCH v2 2/2] usb: cdns3: fix incorrect calculation of
 ep_buf_size when more than one config

On 23-07-07 19:00:15, Frank Li wrote:
> Previously, the cdns3_gadget_check_config() function in the cdns3 driver
> mistakenly calculated the ep_buf_size by considering only one
> configuration's endpoint information because "claimed" will be clear after
> call usb_gadget_check_config().
> 
> The fix involves checking the private flags EP_CLAIMED instead of relying
> on the "claimed" flag.
> 
> Fixes: dce49449e04f ("usb: cdns3: allocate TX FIFO size according to composite EP number")
> Reported-by: Ravi Gunasekaran <r-gunasekaran@...com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/usb/cdns3/cdns3-gadget.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index ccfaebca6faa..3326955f6991 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -2999,12 +2999,14 @@ static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
>  static int cdns3_gadget_check_config(struct usb_gadget *gadget)
>  {
>  	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
> +	struct cdns3_endpoint *priv_ep;
>  	struct usb_ep *ep;
>  	int n_in = 0;
>  	int total;
>  
>  	list_for_each_entry(ep, &gadget->ep_list, ep_list) {
> -		if (ep->claimed && (ep->address & USB_DIR_IN))
> +		priv_ep = ep_to_cdns3_ep(ep);
> +		if ((priv_ep->flags & EP_CLAIMED) && (ep->address & USB_DIR_IN))
>  			n_in++;
>  	}

Acked-by: Peter Chen <peter.chen@...nel.org>

-- 

Thanks,
Peter Chen