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authorAlan Stern <stern@rowland.harvard.edu>2010-03-05 15:10:17 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-20 13:21:31 -0700
commit0ede76fcec5415ef82a423a95120286895822e2d (patch)
tree61aa2a0b499a0101033c59b8884328bdb31e5956 /drivers/usb/wusbcore
parent749da5f82fe33ff68dd4aa1a5e35cd9aa6246dab (diff)
downloadlinux-0ede76fcec5415ef82a423a95120286895822e2d.tar.bz2
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>
Diffstat (limited to 'drivers/usb/wusbcore')
-rw-r--r--drivers/usb/wusbcore/wa-xfer.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/usb/wusbcore/wa-xfer.c b/drivers/usb/wusbcore/wa-xfer.c
index 112ef7e26f6b..2ce6b7eccc6a 100644
--- a/drivers/usb/wusbcore/wa-xfer.c
+++ b/drivers/usb/wusbcore/wa-xfer.c
@@ -474,8 +474,6 @@ static void __wa_xfer_setup_hdr0(struct wa_xfer *xfer,
struct wa_xfer_ctl *xfer_ctl =
container_of(xfer_hdr0, struct wa_xfer_ctl, hdr);
xfer_ctl->bmAttribute = xfer->is_inbound ? 1 : 0;
- BUG_ON(xfer->urb->transfer_flags & URB_NO_SETUP_DMA_MAP
- && xfer->urb->setup_packet == NULL);
memcpy(&xfer_ctl->baSetupData, xfer->urb->setup_packet,
sizeof(xfer_ctl->baSetupData));
break;