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USB: make urb scatter-gather support more generic

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The WHCI HCD will also support urbs with scatter-gather lists.  Add a
usb_bus field to indicated how many sg list elements are supported by
the HCD.  Use this to decide whether to pass the scatter-list to the HCD
or not.

Make the usb-storage driver use this new field.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Vrabel
2009-08-24 14:44:30 +01:00
committed by Greg Kroah-Hartman
parent 09ce497e79
commit 4c1bd3d7a7
4 changed files with 14 additions and 7 deletions
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2
drivers/usb/host/xhci-pci.c
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@ -54,6 +54,8 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
int retval;
hcd->self.sg_tablesize = TRBS_PER_SEGMENT - 1;
xhci->cap_regs = hcd->regs;
xhci->op_regs = hcd->regs +
HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));