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>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index c8d7199eefa0f2db820c9ce47857fcbff2871e8a..246de8905db175f09863904d726160bea943cd97 100644 (file)
--- 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;