linux-kernel - Lock up when faking MMIO read[bwl] on some machines [WAS: Faking MMIO ops? Fooling a driver]

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Message-ID: <BANLkTi=o06eHLtFvmmz7c4TEjahy=EOrJQ@mail.gmail.com>
Date:	Sat, 18 Jun 2011 00:31:32 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-wireless@...r.kernel.org, Pekka Paalanen <pq@....fi>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: Lock up when faking MMIO read[bwl] on some machines [WAS: Faking MMIO
 ops? Fooling a driver]

I use attached patch to fake result of read[bwl] performed by closed
source driver (ndiswrapper+bcmwl and wl).

1) It works great on my Sony VAIO with Intel(R) Core(TM)2 Duo CPU P8400
2) It locks up Macbook Pro 8,1 with some 8-cores Intel

Do you have any idea why it causes the lockup? Function causing
problem is "set_ins_reg_val". I've created it as copy of
get_ins_reg_val, it just sets values in struct pt_regs, instead of
reading them).

-- 
Rafał

Download attachment "mmio.debugging.patch" of type "application/octet-stream" (3947 bytes)