Re: pci_fixup_video() bogosity

[Jon Smirl <jonsmirl@gmail.com>]

Patch to make detection of boot video device more robust. Should I
leave the printk in?

-- 
Jon Smirl
jonsmirl@gmail.com

===== arch/i386/pci/fixup.c 1.24 vs edited =====
--- 1.24/arch/i386/pci/fixup.c	2005-01-11 19:42:41 -05:00
+++ edited/arch/i386/pci/fixup.c	2005-03-10 22:32:35 -05:00
@@ -355,11 +355,12 @@
  * is marked here since the boot video device will be the only enabled
  * video device at this point.
  *
- */static void __devinit pci_fixup_video(struct pci_dev *pdev)
+ */
+static void __devinit pci_fixup_video(struct pci_dev *pdev)
 {
 	struct pci_dev *bridge;
 	struct pci_bus *bus;
-	u16 l;
+	u16 config;
 
 	if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
 		return;
@@ -369,12 +370,16 @@
 	while (bus) {
 		bridge = bus->self;
 		if (bridge) {
-			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, &l);
-			if (!(l & PCI_BRIDGE_CTL_VGA))
+			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, &config);
+			if (!(config & PCI_BRIDGE_CTL_VGA))
 				return;
 		}
 		bus = bus->parent;
 	}
-	pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
+	pci_read_config_word(pdev, PCI_COMMAND, &config);
+	if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
+		pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
+		printk(KERN_INFO "Boot video device is %s\n", pci_name(pdev));
+	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);