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Message-Id: <1375750370-18194-3-git-send-email-ming.lei@canonical.com>
Date: Tue, 6 Aug 2013 08:52:47 +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>,
Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
netdev@...r.kernel.org, linux-usb@...r.kernel.org,
Ming Lei <ming.lei@...onical.com>,
Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH v3 2/4] USB: XHCI: mark no_sg_constraint
This patch marks all xHCI controllers as no_sg_constraint
since xHCI supports building packet from discontinuous buffers.
Cc: Alan Stern <stern@...land.harvard.edu>
Acked-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Signed-off-by: Ming Lei <ming.lei@...onical.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..6e2ac57 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_constraint = 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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