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linux-sg2042
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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@rowland.harvard.edu>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2013-08-08 21:48:23 +08:00 committed by Greg Kroah-Hartman
parent bcc48f1a7a
commit fc76051c45
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/host/xhci.c
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@ -4841,6 +4841,10 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
/* Accept arbitrarily long scatter-gather lists */ /* Accept arbitrarily long scatter-gather lists */
hcd->self.sg_tablesize = ~0; 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 :| */ /* XHCI controllers don't stop the ep queue on short packets :| */
hcd->self.no_stop_on_short = 1; hcd->self.no_stop_on_short = 1;