USB mass storage and ARM cache coherency

[Benjamin Herrenschmidt]

On Wed, 2010-02-17 at 15:27 +0000, Catalin Marinas wrote:
> We do the same on ARM. The problem with most (all) HCD drivers that do
> PIO is that they copy the data to the transfer buffer but there is no
> call in this driver to flush_dcache_page(). The upper mass storage or
> filesystem layers don't call this function either, so there isn't
> anything that would set the PG_arch1 bit. 

Actually, clear it :-)

I suppose that's one thing that needs to be fixed in the drivers.

Cheers,
Ben.