[PATCH 5.19 010/717] mtd: rawnand: atmel: Unmap streaming DMA mappings

Greg Kroah-Hartman
2022-10-22T07:34:07Z

From: Tudor Ambarus <tudor.ambarus@microchip.com>

commit 1161703c9bd664da5e3b2eb1a3bb40c210e026ea upstream.

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.

Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/
Cc: stable@vger.kernel.org
Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Alexander Dahl <ada@thorsis.com>
Reported-by: Peter Rosin <peda@axentia.se>
Tested-by: Alexander Dahl <ada@thorsis.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Tested-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220728074014.145406-1-tudor.ambarus@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mtd/nand/raw/atmel/nand-controller.c | 1 +
1 file changed, 1 insertion(+)

--- 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(struc

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

return 0;