Messages in this thread |  | | | From | Oliver Neukum <> | | Subject | Re: USB mass storage and ARM cache coherency | | Date | Fri, 19 Feb 2010 21:53:22 +0100 |
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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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