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Date: Thu, 28 Jul 2005 09:31:32 -0700
From: Todd Poynor <tpoynor@mvista.com>
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To: Mirco Fuchs <mircofuchs@web.de>
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Cc: linux-mtd@lists.infradead.org
Subject: Re: Problem with AT91RM9200 and intel cfi flash
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Mirco Fuchs wrote:

> #> umount /mnt/jffs2
> 
> The instruction aborts with the following error:
...
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
...
> Backtrace:
> [<c01b22c0>] (__down_write+0x0/0xd4) from [<c00d8140>] (jffs2_flush_wbuf_pad+0x1c/0x3c)

Looks like there were multiple fixes for similar problems, in addition 
to the patch I pointed you at on linux-arm-kernel.  Patch in the latest 
linux-mtd code from CVS and see if it's fixed?  Or if you don't need 
NAND flash support (you mention Intel CFI flash) then 
CONFIG_JFFS2_FS_NAND=n might get rid of it.

-- 
Todd