linux-kernel - Re: [PATCH] mtd: rawnand: atmel: Unmap streaming DMA mappings

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Message-ID: <86158844-b314-bee8-c5b8-0b757c6b6ab0@microchip.com>
Date:   Wed, 7 Sep 2022 09:06:39 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <peda@...ntia.se>
CC:     <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Claudiu.Beznea@...rochip.com>, <bbrezillon@...nel.org>,
        <linux-mtd@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH] mtd: rawnand: atmel: Unmap streaming DMA mappings

On 7/28/22 10:40, Tudor Ambarus 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@...r.kernel.org
> Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.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;
>  

Hi, Richard, Miquel,

Would you please consider to include this patch in your queue?
If yes, please add the following tag, it solves a regression:

Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/

-- 
Cheers,
ta