Messages in this thread | | | Date | Fri, 20 Jun 2008 16:30:25 -0400 (EDT) | From | Alan Stern <> | Subject | Scatter-gather list constraints |
| |
Is there any way to express the constraint that for a particular request queue, all members of a scatter-gather list (except the last) must be a multiple of a particular length?
This question arises in connection with wireless USB mass-storage devices. The controller driver requires that all DMA segments in a transfer, other than the last one, have a multiple of 1024 bytes. But we're sometimes getting s-g lists where an element contains an odd number of 512-byte sectors, and of course it doesn't work.
Thanks,
Alan Stern
| |