On Mon, 9 Dec 2019 14:53:35 -0800 John Hubbard jhubbard@nvidia.com 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.
Reviewed-by: Christoph Hellwig hch@lst.de Acked-by: Hans Verkuil hverkuil-cisco@xs4all.nl Cc: Mauro Carvalho Chehab mchehab@kernel.org Cc: stable@vger.kernel.org
What are the user-visible effects of this change?
As it's cc:stable I'd normally send this to Linus within 1-2 weeks, or sooner. Please confirm that this is a standalone fix, independent of the rest of this series.