The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
1161703c9bd6 ("mtd: rawnand: atmel: Unmap streaming DMA mappings")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 1161703c9bd664da5e3b2eb1a3bb40c210e026ea Mon Sep 17 00:00:00 2001
From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Date: Thu, 28 Jul 2022 10:40:14 +0300
Subject: [PATCH] mtd: rawnand: atmel: Unmap streaming DMA mappings
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@xxxxxxxxxx/
Cc: stable@xxxxxxxxxxxxxxx
Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Acked-by: Alexander Dahl <ada@xxxxxxxxxxx>
Reported-by: Peter Rosin <peda@xxxxxxxxxx>
Tested-by: Alexander Dahl <ada@xxxxxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Tested-by: Peter Rosin <peda@xxxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20220728074014.145406-1-tudor.ambarus@xxxxxxxxxxxxx
diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
index c9ac3baf68c0..41c6bd6e2d72 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;
