netdev - Realtek 8169 problems with net booting

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Message-ID: <20081124181456.66a967d2@lxorguk.ukuu.org.uk>
Date:	Mon, 24 Nov 2008 18:14:56 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	netdev@...r.kernel.org
Subject: Realtek 8169 problems with net booting

On one box here it has always been the case that now and then the boot
with crash just after r8169 is loaded iff the BIOS network rom (ie the
dhcp stuff) is enabled. Its erratic, hard to reproduce but I finally got
around to looking at the driver and have a question that seems to apply
to several network drivers

8169 does this

	pci_set_master
	twiddle a few bits
	soft reset chip

The master bit is off when the driver is loaded it appears but surely the
driver should do

	twiddle a few bits
	soft reset chip
	pci_set_master

otherwise it has no idea if a warm boot from Linux without neat shutdown,
or a BIOS tftp has left the chip trying to spew into main memory ?

Alan

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