diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2010-03-05 15:10:17 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-20 13:21:31 -0700 |
| commit | 0ede76fcec5415ef82a423a95120286895822e2d (patch) | |
| tree | 61aa2a0b499a0101033c59b8884328bdb31e5956 /drivers/usb/storage/transport.c | |
| parent | 749da5f82fe33ff68dd4aa1a5e35cd9aa6246dab (diff) | |
| download | linux-0ede76fcec5415ef82a423a95120286895822e2d.tar.gz | |
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/storage/transport.c')
| -rw-r--r-- | drivers/usb/storage/transport.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c index f253edec3bb82..44716427c51c9 100644 --- a/drivers/usb/storage/transport.c +++ b/drivers/usb/storage/transport.c @@ -147,11 +147,9 @@ static int usb_stor_msg_common(struct us_data *us, int timeout) * hasn't been mapped for DMA. Yes, this is clunky, but it's * easier than always having the caller tell us whether the * transfer buffer has already been mapped. */ - us->current_urb->transfer_flags = URB_NO_SETUP_DMA_MAP; if (us->current_urb->transfer_buffer == us->iobuf) us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; us->current_urb->transfer_dma = us->iobuf_dma; - us->current_urb->setup_dma = us->cr_dma; /* submit the URB */ status = usb_submit_urb(us->current_urb, GFP_NOIO); |