• Dan Williams's avatar
    async_xor: dma_map destination DMA_BIDIRECTIONAL · a06d568f
    Dan Williams authored
    Mapping the destination multiple times is a misuse of the dma-api.
    Since the destination may be reused as a source, ensure that it is only
    mapped once and that it is mapped bidirectionally.  This appears to add
    ugliness on the unmap side in that it always reads back the destination
    address from the descriptor, but gcc can determine that dma_unmap is a
    nop and not emit the code that calculates its arguments.
    
    Cc: <stable@kernel.org>
    Cc: Saeed Bishara <saeed@marvell.com>
    Acked-by: default avatarYuri Tikhonov <yur@emcraft.com>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    a06d568f
mv_xor.c 35.7 KB