Oleksandr Tyshchenko 9744be5e89 xen/gntdev: Fix the abuse of underlying struct page in DMA-buf import
[ Upstream commit 2d2db7d40254d5fb53b11ebd703cd1ed0c5de7a1 ]

DO NOT access the underlying struct page of an sg table exported
by DMA-buf in dmabuf_imp_to_refs(), this is not allowed.
Please see drivers/dma-buf/dma-buf.c:mangle_sg_table() for details.

Fortunately, here (for special Xen device) we can avoid using
pages and calculate gfns directly from dma addresses provided by
the sg table.

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Link: https://lore.kernel.org/r/20240107103426.2038075-1-olekstysh@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-02-05 20:14:31 +00:00
..
2023-08-21 15:58:57 +02:00
2023-08-22 12:12:50 +02:00
2023-04-27 17:27:06 -07:00