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6d65b78a09
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> |
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