From: Aaro Koskinen
> octeon-hcd will crash the kernel when SLOB is used. This usually happens
> after the 18-byte control transfer when a device descriptor is read.
> The DMA engine is always transfering full 32-bit words and if the
> transfer is shorter, some random garbage appears after the buffer.
> The problem is not visible with SLUB since it rounds up the allocations
> to word boundary, and the extra bytes will go undetected.
>
> Fix by providing quirk functions for DMA map/unmap that allocate a bigger
> temporary buffer when necessary. Tested by booting EdgeRouter Lite
> to USB stick root file system with SLAB, SLOB and SLUB kernels.
Wouldn't it be simpler to just round up the existing allocation?
(With a comment that some DMA controllers write whole words.)
David
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