linux-kernel - Re: [2.6.23.1] PCI device locking up the computer when its module loads

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Message-ID: <624437.35639.qm@web52911.mail.re2.yahoo.com>
Date:	Sat, 8 Dec 2007 18:39:20 +0000 (GMT)
From:	Chris Rankin <rankincj@...oo.com>
To:	Dan Williams <dcbw@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chris Rankin <rankincj@...oo.com>, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: [2.6.23.1] PCI device locking up the computer when its module loads

> > On Mon, 22 Oct 2007 13:43:16 +0100 (BST) Chris Rankin <rankincj@...oo.com> wrote:
> > > I have a Netgear MA301 PLX wireless networking adapter which wants to use the hostap_plx
> > > driver in Linux 2.6.23.1. This very same piece of hardware works fine in an old(!) P120
> > > machine running 2.4.33, but makes the 2.6.23.1 kernel freeze as soon as the
> > > pci_enable_device() function is called in prism2_plx_probe.

Interestingly, I have just discovered that I can do the following on this machine *without*
locking it up (on Linux 2.6.23.9):

# cat /sys/bus/pci/devices/0000:00:0e.0/enable
0
# echo 1 > /sys/bus/pci/devices/0000:00:0e.0/enable
# cat /sys/bus/pci/devices/0000:00:0e.0/enable
1

where according to lspci:

00:0e.0 Network controller: Netgear MA301 802.11b Wireless PCI Adapter (rev 02)

Doesn't writing to this sysfs file also call pci_enable_device()? Loading the hostap_plx module is
still instantly lethal.

Cheers,
Chris



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