Messages in this thread | | | Date | Thu, 27 Jan 2011 11:01:47 -0500 (EST) | From | Alan Stern <> | Subject | Re: [PATCH 2/3] USB: HCD: Add driver hooks for (un)?map_urb_for_dma |
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On Wed, 26 Jan 2011, Robert Morell wrote:
> Provide optional hooks for the host controller driver to override the > default DMA mapping and unmapping routines. In general, these shouldn't > be necessary unless the host controller has special DMA requirements, > such as alignment contraints. If these are not specified, the > general usb_hcd_(un)?map_urb_for_dma functions will be used instead. > Also, pass the status to unmap_urb_for_dma so it can know whether the > DMA buffer has been overwritten. > > Finally, add a flag to be used by these implementations if they > allocated a temporary buffer so it can be freed properly when unmapping. > > Signed-off-by: Robert Morell <rmorell@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
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