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Subject: Re: [Bug]: mtd: onenand: omap2plus: kernel panic with OneNAND on OMAP3 (DM3730) device GTA04A5
From:   "H. Nikolaus Schaller" <hns@goldelico.com>
In-Reply-To: <20180412150306.GB5700@atomide.com>
Date:   Thu, 12 Apr 2018 17:51:31 +0200
Cc:     Ladislav Michl <ladis@linux-mips.org>,
        Boris Brezillon <boris.brezillon@free-electrons.com>,
        Peter Ujfalusi <peter.ujfalusi@ti.com>,
        Aaro Koskinen <aaro.koskinen@iki.fi>,
        Roger Quadros <rogerq@ti.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-omap <linux-omap@vger.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@openphoenux.org>
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References: <5D496D5C-4E3E-47B4-9981-E8F4C348DE00@goldelico.com> <20180410205643.GA2228@lenoch> <AF1CE94F-FE95-49B1-99FF-AEC0C3EFFCA1@goldelico.com> <20180412150306.GB5700@atomide.com>
To:     Tony Lindgren <tony@atomide.com>
Sender: linux-kernel-owner@vger.kernel.org
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Hi Tony,

> Am 12.04.2018 um 17:03 schrieb Tony Lindgren <tony@atomide.com>:
> 
> * H. Nikolaus Schaller <hns@goldelico.com> [180411 07:05]:
>>> Am 10.04.2018 um 22:56 schrieb Ladislav Michl <ladis@linux-mips.org>:
>>> Well, that's a shame... However, this code is in production for several
>>> months now,
>> 
>> Well, we could have tested earlier release-candidates...
> 
> I've found it's way easier to test Linux next on regular basis
> and report the regressions compared to chasing regressions after
> the merge window or tagged kernels. By that time you may have
> already multiple regressions to deal with which is always fun.
> 
> If you have products running with mainline kernel, maybe set up
> automated boot testing for core devices to catch regressions
> early?

Well, it is rare that we face upstream regressions of this severe
kind. Every 2-3 years... We much more often have to face missing
features in upstream so that we add our own patch sets on top
of each -rc.

In this case here we could have found this right after the merge window
when v4.16-rc1 came out. But by bad chance (and holidays and other
more important tasks) we did only test on GTA04 boards with standard
NAND. And just now did boot a board with OneNAND installed and were
surprised by this boot problem.

BR,
Nikolaus