linux-kernel - Re: [PATCH 04/25] dmaengine: Fix dma_slave_config.dst

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Date:   Thu, 24 Mar 2022 19:38:06 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Frank Li <Frank.Li@....com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-pci@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/25] dmaengine: Fix dma_slave_config.dst_addr
 description

On Thu, Mar 24, 2022 at 04:48:15AM +0300, Serge Semin wrote:
> Most likely due to a copy-paste mistake the dst_addr member of the
> dma_slave_config structure has been marked as ignored if the !source!
> address belong to the memory. That is relevant to the src_addr field of
> the structure while the dst_addr field as containing a destination device
> address is supposed to be ignored if the destination is the CPU memory.
> Let's fix the field description accordingly.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

One suggestion below.

> ---
>  include/linux/dmaengine.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index 842d4f7ca752..f204ea16ac1c 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -395,7 +395,7 @@ enum dma_slave_buswidth {
>   * should be read (RX), if the source is memory this argument is
>   * ignored.
>   * @dst_addr: this is the physical address where DMA slave data
> - * should be written (TX), if the source is memory this argument
> + * should be written (TX), if the destination is memory this argument

Should we rename "memory" to "local memory" or something similar?

Thanks,
Mani

>   * is ignored.
>   * @src_addr_width: this is the width in bytes of the source (RX)
>   * register where DMA data shall be read. If the source
> -- 
> 2.35.1
>