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

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Message-ID: <YHA7X5w8cLuelWll@kroah.com>
Date:   Fri, 9 Apr 2021 13:32:47 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Koen Vandeputte <koen.vandeputte@...ymesh.com>,
        linux-can@...r.kernel.org, wg@...ndegger.com,
        netdev@...r.kernel.org, qiangqing.zhang@....com
Subject: Re: flexcan introduced a DIV/0 in kernel

On Fri, Apr 09, 2021 at 01:21:05PM +0200, 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?

Now queued up, thanks.

greg k-h