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

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Date:   Fri, 9 Apr 2021 13:21:05 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Koen Vandeputte <koen.vandeputte@...ymesh.com>,
        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 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

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |



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