Thread (155 messages) 155 messages, 18 authors, 2010-03-11

USB mass storage and ARM cache coherency

From: oliver@neukum.org (Oliver Neukum)
Date: 2010-02-19 20:53:42
Also in: lkml 

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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