1 files changed, 4 insertions, 5 deletions

diff --git a/arch/i386/kernel/quirks.c b/arch/i386/kernel/quirks.c
index aaf89cb2bc51..87ccdac84928 100644
--- a/arch/i386/kernel/quirks.c
+++ b/arch/i386/kernel/quirks.c
@@ -25,8 +25,7 @@ static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
 
         /* enable access to config space*/
         pci_read_config_byte(dev, 0xf4, &config);
-        config |= 0x2;
-        pci_write_config_byte(dev, 0xf4, config);
+        pci_write_config_byte(dev, 0xf4, config|0x2);
 
         /* read xTPR register */
         raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
@@ -42,9 +41,9 @@ static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)
 #endif
         }
 
-        config &= ~0x2;
-        /* disable access to config space*/
-        pci_write_config_byte(dev, 0xf4, config);
+        /* put back the original value for config space*/
+        if (!(config & 0x2))
+                pci_write_config_byte(dev, 0xf4, config);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7320_MCH,  quirk_intel_irqbalance);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_E7525_MCH,  quirk_intel_irqbalance);