linux-kernel - Bug in PCI core

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Message-ID: <Pine.LNX.4.44L0.0610111632240.6353-100000@iolanthe.rowland.org>
Date:	Wed, 11 Oct 2006 16:41:22 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <greg@...ah.com>
cc:	linux-pci@...ey.karlin.mff.cuni.cz,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Bug in PCI core

When a PCI device is suspended, its driver calls pci_save_state() so that
the config space can be restored when the device is resumed.  Then the
driver calls pci_set_power_state().

However pci_set_power_state() calls pci_block_user_cfg_access(), and that 
routine calls pci_save_state() again.  This overwrites the saved state 
with data in which memory, I/O, and bus master accesses are disabled.  As 
a result, when the device is resumed it doesn't work.

Obviously pci_block_user_cfg_access() needs to be fixed.  I don't know the 
right way to fix it; hopefully somebody else does.

Alan Stern

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