Re: USB mass storage and ARM cache coherency

[Catalin Marinas]

On Tue, 2010-02-02 at 13:36 +0000, Ming Lei wrote:
> 2010/2/2 Catalin Marinas <catalin.marinas@xxxxxxx>:
> 
> > In the iSCSI case, does the HCD driver write directly to a page cache
> > page? Or it just fills in network packets that are copied to page cache
> > pages by the iSCSI code (sorry, I'm not familiar with this part of the
> > kernel). If the latter, the cache flushing in the HCD driver would not
> > help and it needs to be done in the iSCSI code.
> 
> So we should flush dcache page in the place where the user mapped
> page is copied to, instead of low level driver which does not do such
> thing always.

Or both if you can't be sure whether the driver copies directly to a
page cache page.

-- 
Catalin

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