netdev - Re: flexcan introduced a DIV/0 in kernel

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Date:   Fri, 9 Apr 2021 14:55:59 +0200
From:   Koen Vandeputte <koen.vandeputte@...ymesh.com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org
Cc:     wg@...ndegger.com, netdev@...r.kernel.org, qiangqing.zhang@....com,
        gregkh@...uxfoundation.org
Subject: Re: flexcan introduced a DIV/0 in kernel


On 09.04.21 13:21, Marc Kleine-Budde wrote:
> On 4/9/21 12:18 PM, Koen Vandeputte wrote:
>> Hi All,
>>
>> I just updated kernel 4.14 within OpenWRT from 4.14.224 to 4.14.229
>> Booting it shows the splat below on each run. [1]
>>
>>
>> It seems there are 2 patches regarding flexcan which were introduced in
>> 4.14.226
>>
>> --> ce59ffca5c49 ("can: flexcan: enable RX FIFO after FRZ/HALT valid")
>> --> bb7c9039a396 ("can: flexcan: assert FRZ bit in flexcan_chip_freeze()")
>>
>> Reverting these fixes the splat.
> This patch should fix the problem:
>
> 47c5e474bc1e can: flexcan: flexcan_chip_freeze(): fix chip freeze for missing
> bitrate
>
> Greg, can you pick this up for v4.14?
>
> regards,
> Marc
>
Checking kernels 4.4 & 4.9 shows that this fix is also missing over there.


Marc,

Can you confirm that it's also required for these?


Thanks,

Koen