netdev - Re: [PATCH -v1 3/3] usbnet: handle remote wakeup asap

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Date:	Wed, 20 Jun 2012 15:02:12 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Ming Lei <ming.lei@...onical.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Oliver Neukum <oneukum@...e.de>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH -v1 3/3] usbnet: handle remote wakeup asap

Hello.

On 20-06-2012 11:15, Ming Lei wrote:

> If usbnet is resumed by remote wakeup, generally there are
> some packets comming to be handled, so allocate and submit
> rx URBs in usbnet_resume to avoid delays introduced by tasklet.
> Otherwise, usbnet may have been runtime suspended before the
> usbnet_bh is executed to schedule Rx URBs.

> Without the patch, usbnet can't recieve any packets from peer
> in runtime suspend state if runtime PM is enabled and
> autosuspend_delay is set as zero.

> Signed-off-by: Ming Lei<ming.lei@...onical.com>
> ---
>   drivers/net/usb/usbnet.c |   42 ++++++++++++++++++++++++++----------------
>   1 file changed, 26 insertions(+), 16 deletions(-)

> diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
> index 9bfa775..a89d6c5 100644
> --- a/drivers/net/usb/usbnet.c
> +++ b/drivers/net/usb/usbnet.c
> @@ -1201,6 +1201,21 @@ deferred:
>   }
>   EXPORT_SYMBOL_GPL(usbnet_start_xmit);
>
> +static void rx_alloc_submit(struct usbnet *dev, gfp_t flags)
> +{
> +	struct urb	*urb;
> +	int		i;
> +
> +	/* don't refill the queue all at once */
> +	for (i = 0; i<  10&&  dev->rxq.qlen<  RX_QLEN(dev); i++) {
> +		urb = usb_alloc_urb(0, flags);
> +		if (urb != NULL) {
> +			if (rx_submit(dev, urb, flags) == -ENOLINK)

    The above 2 *if* statements can be collapsed into single one.

> +				return;
> +		}
> +	}
> +}
> +

WBR, Sergei
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