usbcore: Add flag for whether a host controller uses DMA

This patch (as770b) introduces a new field to usb_bus: a flag
indicating whether or not the host controller uses DMA.  This serves
to encapsulate the computation.  It also means we will have only one
spot to update if the DMA API changes.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 2102c4deec1e..0cc14206920a 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1152,7 +1152,7 @@ doit:
         /* lower level hcd code should use *_dma exclusively,
          * unless it uses pio or talks to another transport.
          */
-        if (hcd->self.controller->dma_mask) {
+        if (hcd->self.uses_dma) {
                 if (usb_pipecontrol (urb->pipe)
                         && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
                         urb->setup_dma = dma_map_single (
@@ -1585,8 +1585,9 @@ void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs
         at_root_hub = (urb->dev == hcd->self.root_hub);
         urb_unlink (urb);
 
-        /* lower level hcd code should use *_dma exclusively */
-        if (hcd->self.controller->dma_mask && !at_root_hub) {
+        /* lower level hcd code should use *_dma exclusively if the
+         * host controller does DMA */
+        if (hcd->self.uses_dma && !at_root_hub) {
                 if (usb_pipecontrol (urb->pipe)
                         && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
                         dma_unmap_single (hcd->self.controller, urb->setup_dma,
@@ -1710,6 +1711,7 @@ struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
         hcd->self.release = &hcd_release;
         hcd->self.controller = dev;
         hcd->self.bus_name = bus_name;
+        hcd->self.uses_dma = (dev->dma_mask != NULL);
 
         init_timer(&hcd->rh_timer);
         hcd->rh_timer.function = rh_timer_func;