netdev - Re: [PATCH net-next 01/11] net: cdc_ncm: split out rx_max/tx

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Date:	Tue, 13 May 2014 10:09:06 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Alexey Orishko <alexey.orishko@...il.com>,
	Enrico Mioso <mrkiko.rs@...il.com>,
	David Laight <David.Laight@...LAB.COM>
Subject: Re: [PATCH net-next 01/11] net: cdc_ncm: split out rx_max/tx_max
 update of setup

On Sat, 2014-05-10 at 17:41 +0200, Bjørn Mork wrote:
> Split out the part of setup dealing with updating the rx_max
> and tx_max buffer sizes so that this code can be reused for
> dynamically updating the limits.
> 
> Signed-off-by: Bjørn Mork <bjorn@...k.no>
> ---
>  drivers/net/usb/cdc_ncm.c | 81 +++++++++++++++++++++++++++++------------------
>  1 file changed, 50 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
> index 549dbac710ed..87a32edf7ea5 100644
> --- a/drivers/net/usb/cdc_ncm.c
> +++ b/drivers/net/usb/cdc_ncm.c
> @@ -65,6 +65,54 @@ static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
>  static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
>  static struct usb_driver cdc_ncm_driver;
>  
> +/* handle rx_max and tx_max changes */
> +static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
> +{
> +	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
> +	u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
> +	u32 val, max, min;
> +
> +	/* clamp new_rx to sane values */
> +	min = min_t(u32, USB_CDC_NCM_NTB_MIN_IN_SIZE, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
> +	max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));

Are you sure this makes sense? min_t both times?

	Regards
		Oliver


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