linux-kernel - Re: [PATCH 07/33] dmaengine: at_hdmac: Fix at

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Message-ID: <Y1AoDDVoiWDJ2ae2@matsya>
Date:   Wed, 19 Oct 2022 22:08:36 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
Cc:     peda@...ntia.se, du@...ntia.se, regressions@...mhuis.info,
        ludovic.desroches@...rochip.com, maciej.sosnowski@...el.com,
        dan.j.williams@...el.com, nicolas.ferre@...rochip.com,
        mripard@...nel.org, torfl6749@...il.com,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Tudor Ambarus <tudor.ambarus@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH 07/33] dmaengine: at_hdmac: Fix at_lli struct definition

On 20-08-22, 15:56, Tudor Ambarus wrote:
> From: Tudor Ambarus <tudor.ambarus@...il.com>
> 
> Those hardware registers are all of 32 bits, while dma_addr_t ca be of
> type u64 or u32 depending on CONFIG_ARCH_DMA_ADDR_T_64BIT. Force u32 to
> comply with what the hardware expects.
> 
> Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller")
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...il.com>
> Cc: stable@...r.kernel.org

Okay

> ---
>  drivers/dma/at_hdmac.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
> index 91e53a590d5f..e89facf14fab 100644
> --- a/drivers/dma/at_hdmac.c
> +++ b/drivers/dma/at_hdmac.c
> @@ -187,13 +187,13 @@
>  /* LLI == Linked List Item; aka DMA buffer descriptor */
>  struct at_lli {
>  	/* values that are not changed by hardware */
> -	dma_addr_t	saddr;
> -	dma_addr_t	daddr;
> +	u32 saddr;
> +	u32 daddr;

I think you should add fixes first in the series and then do header
move, that way we can backport this and other fixes to stable kernels...

>  	/* value that may get written back: */
> -	u32		ctrla;
> +	u32 ctrla;
>  	/* more values that are not changed by hardware */
> -	u32		ctrlb;
> -	dma_addr_t	dscr;	/* chain to next lli */
> +	u32 ctrlb;
> +	u32 dscr;	/* chain to next lli */
>  };
>  
>  /**
> -- 
> 2.25.1

-- 
~Vinod