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>

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 2102c4deec1eb06a9798c8b74cba7678e73aaf4c..0cc14206920aa28b873a352fe2ef0bd15570d282 100644 (file)
--- 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;

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 4709033f8fa725a834795e42837b030184226ed2..09661759621fd4127d5dd663385ba09e8889f93c 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -269,6 +269,7 @@ struct usb_bus {
        struct device *controller;      /* host/master side hardware */
        int busnum;                     /* Bus number (in order of reg) */
        char *bus_name;                 /* stable id (PCI slot_name etc) */
+       u8 uses_dma;                    /* Does the host controller use DMA? */
        u8 otg_port;                    /* 0, or number of OTG/HNP port */
        unsigned is_b_host:1;           /* true during some HNP roleswitches */
        unsigned b_hnp_enable:1;        /* OTG: did A-Host enable HNP? */