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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2009-04-27 19:57:50 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 21:44:49 -0700
commit6d65b78a093552fb42448480d4c66bf093a6d4cf (patch)
tree38d5797b9cdd60421d6b28db225d34c9f2e56f6f /drivers/usb/host/xhci-ring.c
parent3ffbba9511b4148cbe1f6b6238686adaeaca8feb (diff)
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 'drivers/usb/host/xhci-ring.c')
0 files changed, 0 insertions, 0 deletions