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FromOliver Neukum <>
SubjectRe: USB mass storage and ARM cache coherency
DateFri, 19 Feb 2010 21:53:22 +0100
Am Freitag, 19. Februar 2010 18:36:51 schrieb Catalin Marinas:
> If a page is already mapped in user space, flush_dcache_page() on ARM
> does the flushing rather than deferring it to update_mmu_cache(). The
> PIO HCD drivers, however, don't call flush_dcache_page(). Is it possible
> that the HCD could transfer data into a page cache page already mapped
> in user space? My understanding is that the scenario above is possible.

Yes, video drivers do that.

Regards
Oliver


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