[AGPGART] intel_agp: restore graphics device's pci space early in resume

Currently in resuming path graphics device's pci space restore is
behind host bridge, so resume function wrongly accesses graphics
device's space. This makes resuming failure which crashed X.
here's a patch to restore device's pci space early, which makes
resuming ok with X.
Signed-off-by: Wang Zhenyu <zhenyu.z.wang@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/char/agp/intel-agp.c

@@ -1955,6 +1955,15 @@ static int agp_intel_resume(struct pci_dev *pdev)
 
 	pci_restore_state(pdev);
 
+	/* We should restore our graphics device's config space,
+	 * as host bridge (00:00) resumes before graphics device (02:00),
+	 * then our access to its pci space can work right.
+	 */
+	if (intel_i810_private.i810_dev)
+		pci_restore_state(intel_i810_private.i810_dev);
+	if (intel_i830_private.i830_dev)
+		pci_restore_state(intel_i830_private.i830_dev);
+
 	if (bridge->driver == &intel_generic_driver)
 		intel_configure();
 	else if (bridge->driver == &intel_850_driver)