Re: [PATCH] mtd: rawnand: atmel: Unmap streaming DMA mappings
From: Boris Brezillon <boris.brezillon@collabora.com>
Date: 2022-08-16 10:08:18
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On Thu, 28 Jul 2022 10:40:14 +0300 Tudor Ambarus [off-list ref] wrote:
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 <redacted>Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
quoted hunk ↗ jump to hunk
--- 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;
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