Hello Tudor,
Am Donnerstag, 28. Juli 2022, 09:40:14 CEST schrieb Tudor Ambarus:
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;
Acked-by: Alexander Dahl ada@thorsis.com
After studying https://www.kernel.org/doc/html/latest/core-api/dma-api-howto.html this seems like the correct thing to do to me.
I was made aware of this patch in IRC, after discussing a strange lzo decompression and/or page reading error with Richard after upgrading from kernel v5.2.21-rt13 to v5.15.49-rt47.
Now testing this on top of 5.15.49-rt47 on two boards, both with Microchip sama5d27c 128MiB SiP and Spansion S34ML02G1 raw nand flash. Will report later.
Thanks and greets Alex