On Wed, Nov 20, 2019 at 11:13:38PM -0800, John Hubbard wrote: > After DMA is complete, and the device and CPU caches are synchronized, > it's still required to mark the CPU pages as dirty, if the data was > coming from the device. However, this driver was just issuing a > bare put_page() call, without any set_page_dirty*() call. > > Fix the problem, by calling set_page_dirty_lock() if the CPU pages > were potentially receiving data from the device. Looks good, and like a fix that should be queued up through the media tree for 5.5 and maybe even added to -stable. Reviewed-by: Christoph Hellwig <hch@xxxxxx>
