netdev - Re: [PATCH 2/4] USB: XHCI: mark no_sg

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Date:	Wed, 31 Jul 2013 09:40:26 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.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>,
	Freddy Xin <freddy@...x.com.tw>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Grant Grundler <grundler@...gle.com>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/4] USB: XHCI: mark no_sg_limit

On Wed, Jul 31, 2013 at 06:51:47PM +0800, Ming Lei wrote:
> This patch marks all xHCI controllers as no_sg_limit since
> xHCI supports building packet from discontinuous buffers.
> 
> Cc: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>

Acked-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>

> ---
>  drivers/usb/host/xhci.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 2c49f00..541b155 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -4841,6 +4841,10 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
>  
>  	/* Accept arbitrarily long scatter-gather lists */
>  	hcd->self.sg_tablesize = ~0;
> +
> +	/* support to build packet from discontinuous buffers */
> +	hcd->self.no_sg_limit = 1;
> +
>  	/* XHCI controllers don't stop the ep queue on short packets :| */
>  	hcd->self.no_stop_on_short = 1;
>  
> -- 
> 1.7.9.5
> 
> --
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