Patchwork [v3,2/4] USB: XHCI: mark no_sg_constraint

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Submitter Ming Lei
Date Aug. 6, 2013, 12:52 a.m.
Message ID <1375750370-18194-3-git-send-email-ming.lei@canonical.com>
Download mbox | patch
Permalink /patch/264823/
State Changes Requested
Delegated to: David Miller
Headers show

Comments

Ming Lei - Aug. 6, 2013, 12:52 a.m.
This patch marks all xHCI controllers as no_sg_constraint
since xHCI supports building packet from discontinuous buffers.

Cc: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
 drivers/usb/host/xhci.c |    4 ++++
 1 file changed, 4 insertions(+)

Patch

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;