linux-kernel - Re: [Letux-kernel] [Bug]: mtd: onenand: omap2plus: kernel panic with OneNAND on OMAP3 (DM3730) device GTA04A5

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Date:   Wed, 11 Apr 2018 06:59:03 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     Ladislav Michl <ladis@...ux-mips.org>
Cc:     Discussions about the Letux Kernel <letux-kernel@...nphoenux.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        linux-omap <linux-omap@...r.kernel.org>,
        Roger Quadros <rogerq@...com>
Subject: Re: [Letux-kernel] [Bug]: mtd: onenand: omap2plus: kernel panic
 with OneNAND on OMAP3 (DM3730) device GTA04A5

Hi Ladis,

On Tue, 10 Apr 2018 22:56:43 +0200
Ladislav Michl <ladis@...ux-mips.org> wrote:

> Hi Nikolaus,
> 
> On Tue, Apr 10, 2018 at 06:25:17PM +0200, H. Nikolaus Schaller wrote:
> > Hi,
> > we just started testing the v4.16 kernel and found the
> > device no longer bootable (works with v4.15). It turned
> > out that there was a harmful modification somewhere between
> > v4.15.0 and v4.16-rc1.
> > 
> > A git bisect points to this patch:  
> 
> Well, that's a shame... However, this code is in production for several
> months now, so could you, please put 'goto out_copy' if 'buf >= high_memory'
> condition is met, ie:
> --- a/drivers/mtd/nand/onenand/omap2.c
> +++ b/drivers/mtd/nand/onenand/omap2.c
> @@ -392,6 +392,7 @@ static int omap2_onenand_read_bufferram(struct mtd_info *mtd, int area,
>  	if (buf >= high_memory) {
>  		struct page *p1;
>  
> +		goto out_copy;
>  		if (((size_t)buf & PAGE_MASK) !=
>  		    ((size_t)(buf + count - 1) & PAGE_MASK))
>  			goto out_copy;

I had the same problem here, and that snippet  helps here. ubiattach
-p /dev/mtdX does not cause kernel oopses here anymore


Regards,
Andreas

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