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author | Alan Stern <stern@rowland.harvard.edu> | 2010-03-05 15:10:17 -0500 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-20 13:21:31 -0700 |
commit | 0ede76fcec5415ef82a423a95120286895822e2d (patch) | |
tree | 61aa2a0b499a0101033c59b8884328bdb31e5956 /drivers/usb/host | |
parent | 749da5f82fe33ff68dd4aa1a5e35cd9aa6246dab (diff) | |
download | op-kernel-dev-0ede76fcec5415ef82a423a95120286895822e2d.zip op-kernel-dev-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/host')
0 files changed, 0 insertions, 0 deletions