linux-kernel - [PATCH 5.4 009/255] mtd: rawnand: atmel: Unmap streaming DMA mappings

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Date:   Mon, 24 Oct 2022 13:28:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Alexander Dahl <ada@...rsis.com>,
        Peter Rosin <peda@...ntia.se>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 5.4 009/255] mtd: rawnand: atmel: Unmap streaming DMA mappings

From: Tudor Ambarus <tudor.ambarus@...rochip.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@...r.kernel.org
Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
Acked-by: Alexander Dahl <ada@...rsis.com>
Reported-by: Peter Rosin <peda@...ntia.se>
Tested-by: Alexander Dahl <ada@...rsis.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
Tested-by: Peter Rosin <peda@...ntia.se>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Link: https://lore.kernel.org/linux-mtd/20220728074014.145406-1-tudor.ambarus@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -402,6 +402,7 @@ 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;