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authorJacopo Mondi2018-04-13 19:25:37 +0200
committerChristoph Hellwig2018-04-23 14:44:24 +0200
commit60695be2bb6b0623f8e53bd9949d582a83c6d44a (patch)
tree8d8c20c6897285ee5cc68e3dfef0e21ae2378ae9 /drivers/ptp/ptp_private.h
parent41d0bbc749471522714efd0649b7e033fefcbfb4 (diff)
dma-mapping: postpone cpu addr translation on mmap
Postpone calling virt_to_page() translation on memory locations not guaranteed to be backed by a struct page. Try first to map memory from the device coherent memory pool, then perform translation if that fails. On some architectures, specifically SH when configured with the SPARSEMEM memory model, assuming a struct page is always assigned to a memory address lead to unexpected hangs during the virtual to page address translation. This patch fixes that specific issue but applies in the general case too. Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/ptp/ptp_private.h')
0 files changed, 0 insertions, 0 deletions