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[PATCH] PCI: Improve PCI config space writeback

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At least one laptop blew up on resume from suspend with a black screen due
to a lack of this patch.  By only writing back config space that is
different, we minimise the possibility of accidents like this.

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dave Jones 2006-04-18 21:06:51 -07:00 committed by Greg Kroah-Hartman
parent 8d92bc2270
commit 04d9c1a110
1 changed files with 12 additions and 2 deletions
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14
drivers/pci/pci.c
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@ -461,9 +461,19 @@ int
pci_restore_state(struct pci_dev *dev)
{
int i;
int val;
for (i = 0; i < 16; i++)
pci_write_config_dword(dev,i * 4, dev->saved_config_space[i]);
for (i = 0; i < 16; i++) {
pci_read_config_dword(dev, i * 4, &val);
if (val != dev->saved_config_space[i]) {
printk(KERN_DEBUG "PM: Writing back config space on "
"device %s at offset %x (was %x, writing %x)\n",
pci_name(dev), i,
val, (int)dev->saved_config_space[i]);
pci_write_config_dword(dev,i * 4,
dev->saved_config_space[i]);
}
}
pci_restore_msi_state(dev);
pci_restore_msix_state(dev);
return 0;