netdev - Re: [PATCH v1 1/2] ethernet: arc: fix the device for dma_map_single/dma_unmap

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Message-ID: <f147c6c4-30e8-40cc-8a01-dc8df3913421@gmail.com>
Date: Tue, 29 Oct 2024 15:53:26 +0100
From: Johan Jonker <jbx6244@...il.com>
To: Andrew Lunn <andrew@...n.ch>, andy.yan@...k-chips.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, david.wu@...k-chips.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v1 1/2] ethernet: arc: fix the device for
 dma_map_single/dma_unmap_single



On 10/28/24 14:03, Andrew Lunn wrote:
> On Sun, Oct 27, 2024 at 10:41:48AM +0100, Johan Jonker wrote:
>> The ndev->dev and pdev->dev aren't the same device, use ndev->dev.parent
>> which has dma_mask, ndev->dev.parent is just pdev->dev.
>> Or it would cause the following issue:
>>
>> [   39.933526] ------------[ cut here ]------------
>> [   39.938414] WARNING: CPU: 1 PID: 501 at kernel/dma/mapping.c:149 dma_map_page_attrs+0x90/0x1f8
>>
>> Signed-off-by: David Wu <david.wu@...k-chips.com>
>> Signed-off-by: Johan Jonker <jbx6244@...il.com>
> 
> A few process issues:
> 
> For a patch set please add a patch 0/X which explains the big picture
> of what the patchset does. For a single patch, you don't need one.
> 
> Please read:
> 
> https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html
> 

> It is not clear which tree you intend these patches to be applied
> to. This one looks like it should be to net, but needs a Fixes:
> tag. The MDIO patch might be for net-next? 

Hi Andrew, Andy,

My desktop setup has a problem compiling older kernels for rk3066 MK808 to verify.

Are you able to bisect/compile for rk3036 before this one:

====
commit bc0e610a6eb0d46e4123fafdbe5e6141d9fff3be (HEAD -> test1)
Author: Jianglei Nie <niejianglei2021@....com>
Date:   Wed Mar 9 20:18:24 2022 +0800

    net: arc_emac: Fix use after free in arc_mdio_probe()

====
This is the oldest EMAC related checkout I can compile.
At that patch it still gives this warnings in the kernel log.

[   16.678988] ------------[ cut here ]------------
[   16.684189] WARNING: CPU: 0 PID: 809 at kernel/dma/mapping.c:151 dma_map_page_attrs+0x2b4/0x358

The driver was maintained on auto pilot recent years without a check by Rockchip users somehow.
Currently I don't know where and when this was introduced.
Please advise how to move forward. Should we just mark it net-next?

Johan

> 
>     Andrew
> 
> ---
> pw-bot: cr
> 
>