cache invalidation error for buffered write
The bug causes corruptions of data read from flash. The original code performs cache invalidation from "adr" to "adr + len" in do_write_buffer(). Since len and adr could be updated in the code before invalidation - it causes improper setting of cache invalidation regions. Signed-off-by: NMassimo Cirillo <maxcir@gmail.com> Signed-off-by: NGiuseppe D'Eliseo <giuseppedeliseo@gmail.com> Acked-by: NNicolas Pitre <nico@cam.org> Acked-by: NJörn Engel <joern@logfs.org> Signed-off-by: NDavid Woohouse <dwmw2@infradead.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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