USB: remove uses of URB_NO_SETUP_DMA_MAP

This patch (as1350) removes all usages of coherent buffers for USB
control-request setup-packet buffers.  There's no good reason to
reserve coherent memory for these things; control requests are hardly
ever used in large quantity (the major exception is firmware
transfers, and they aren't time-critical).  Furthermore, only seven
drivers used it.  We might as well always use streaming DMA mappings
for setup-packet buffers, and remove some extra complexity from
usbcore.

The DMA-mapping portion of hcd.c is currently in flux.  A separate
patch will be submitted to remove support for URB_NO_SETUP_DMA_MAP
after everything else settles down.  The removal should go smoothly,
as by then nobody will be using it.

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

1 files changed, 2 insertions, 7 deletions

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index a21cce6f7403..9dcc82337ced 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -977,15 +977,13 @@ test_ctrl_queue (struct usbtest_dev *dev, struct usbtest_param *param)
                 if (!u)
                         goto cleanup;
 
-                reqp = usb_buffer_alloc (udev, sizeof *reqp, GFP_KERNEL,
-                                &u->setup_dma);
+                reqp = kmalloc(sizeof *reqp, GFP_KERNEL);
                 if (!reqp)
                         goto cleanup;
                 reqp->setup = req;
                 reqp->number = i % NUM_SUBCASES;
                 reqp->expected = expected;
                 u->setup_packet = (char *) &reqp->setup;
-                u->transfer_flags |= URB_NO_SETUP_DMA_MAP;
 
                 u->context = &context;
                 u->complete = ctrl_complete;
@@ -1017,10 +1015,7 @@ cleanup:
                 if (!urb [i])
                         continue;
                 urb [i]->dev = udev;
-                if (urb [i]->setup_packet)
-                        usb_buffer_free (udev, sizeof (struct usb_ctrlrequest),
-                                        urb [i]->setup_packet,
-                                        urb [i]->setup_dma);
+                kfree(urb[i]->setup_packet);
                 simple_free_urb (urb [i]);
         }
         kfree (urb);