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| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2009-04-28 02:57:50 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-06-16 04:44:49 (GMT) |
| commit | 6d65b78a093552fb42448480d4c66bf093a6d4cf (patch) | |
| tree | 38d5797b9cdd60421d6b28db225d34c9f2e56f6f /include/linux/mm.h | |
| parent | 3ffbba9511b4148cbe1f6b6238686adaeaca8feb (diff) | |
| download | linux-fsl-qoriq-6d65b78a093552fb42448480d4c66bf093a6d4cf.tar.xz | |
USB: Support for submitting control URBs under xHCI.
Warn users of URB_NO_SETUP_DMA_MAP about xHCI behavior.
Device drivers can choose to DMA map the setup packet of a control transfer
before submitting the URB to the USB core. Drivers then set the
URB_NO_SETUP_DMA_MAP and pass in the DMA memory address in setup_dma, instead of
providing a kernel address for setup_packet. However, xHCI requires that the
setup packet be copied into an internal data structure, and we need a kernel
memory address pointer for that. Warn users of URB_NO_SETUP_DMA_MAP that they
should provide a valid pointer for setup_packet, along with the DMA address.
FIXME: I'm not entirely sure how to work around this in the xHCI driver
or USB core.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/mm.h')
0 files changed, 0 insertions, 0 deletions