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    Subject[PATCH] mtd: rawnand: atmel: Unmap streaming DMA mappings
    Date
    Every dma_map_single() call should have its dma_unmap_single() counterpart,
    because the DMA address space is a shared resource and one could render the
    machine unusable by consuming all DMA addresses.

    Cc: stable@vger.kernel.org
    Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
    Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
    ---
    drivers/mtd/nand/raw/atmel/nand-controller.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
    index 6ef14442c71a..330d2dafdd2d 100644
    --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
    +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
    @@ -405,6 +405,7 @@ static int atmel_nand_dma_transfer(struct atmel_nand_controller *nc,

    dma_async_issue_pending(nc->dmac);
    wait_for_completion(&finished);
    + dma_unmap_single(nc->dev, buf_dma, len, dir);

    return 0;

    --
    2.25.1
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