Commit 8b8c8d28 authored by Yu, Luming's avatar Yu, Luming Committed by Greg Kroah-Hartman
Browse files

[PATCH] PCI: reverse pci config space restore order

According to Intel ICH spec, there are several rules that Base Address
should be programmed before IOSE  (PCICMD register ) enabled.

For example ICH7:

12.1.3  SATA : the base address register for the bus master register
               should be programmed before this bit is set.

11.1.3:  PCICMD (USB): The base address register for USB should be
                       programmed before this bit is set.

To make sure kernel code follow this rule , and prevent unnecessary
confusion. I proposal this patch.
Signed-off-by: default avatarLuming Yu <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 04d9c1a1
......@@ -463,7 +463,11 @@ pci_restore_state(struct pci_dev *dev)
int i;
int val;
for (i = 0; i < 16; i++) {
* The Base Address register should be programmed before the command
* register(s)
for (i = 15; i >= 0; 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 "
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