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

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Date:	Fri, 15 Jun 2012 10:22:16 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Oliver Neukum <oneukum@...e.de>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, Ming Lei <ming.lei@...onical.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH 3/3] usbnet: handle remote wakeup asap

On Wed, Jun 13, 2012 at 12:20 PM, Ming Lei <ming.lei@...onical.com> 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.
>
> Cc: stable@...r.kernel.org
> 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..4911efa 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, GFP_ATOMIC);

David, sorry, the 'GFP_ATOMIC' above should be 'flags', so could
you take the fixed version from attachment? Or could you do it by
your self?

Thanks,
--
Ming Lei

Download attachment "0003-usbnet-handle-remote-wakeup-asap.patch" of type "application/octet-stream" (2933 bytes)