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

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Message-ID: <20210409131001.7r36v2vd3zmceloj@pengutronix.de>
Date:   Fri, 9 Apr 2021 15:10:01 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Koen Vandeputte <koen.vandeputte@...ymesh.com>
Cc:     linux-can@...r.kernel.org, wg@...ndegger.com,
        netdev@...r.kernel.org, qiangqing.zhang@....com,
        gregkh@...uxfoundation.org
Subject: Re: flexcan introduced a DIV/0 in kernel

On 09.04.2021 14:55:59, Koen Vandeputte wrote:
> 
> 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?

ACK, the fix is needed for v4.4.265 and v4.9.265.

Thanks for checking this,
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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