diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index c380c65..aab5c59 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -61,7 +61,7 @@ struct vga_device {
 	unsigned int mem_lock_cnt;	/* legacy MEM lock count */
 	unsigned int io_norm_cnt;	/* normal IO count */
 	unsigned int mem_norm_cnt;	/* normal MEM count */
-
+	bool bridge_has_one_vga;
 	/* allow IRQ enable/disable hook */
 	void *cookie;
 	void (*irq_set_state)(void *cookie, bool enable);
@@ -165,6 +165,8 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
 	unsigned int wants, legacy_wants, match;
 	struct vga_device *conflict;
 	unsigned int pci_bits;
+	u32 flags = 0;
+
 	/* Account for "normal" resources to lock. If we decode the legacy,
 	 * counterpart, we need to request it as well
 	 */
@@ -237,16 +239,23 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
 		/* looks like he doesn't have a lock, we can steal
 		 * them from him
 		 */
-		vga_irq_set_state(conflict, false);
 
+		flags = 0;
 		pci_bits = 0;
-		if (lwants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
-			pci_bits |= PCI_COMMAND_MEMORY;
-		if (lwants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
-			pci_bits |= PCI_COMMAND_IO;
 
-		pci_set_vga_state(conflict->pdev, false, pci_bits,
-				  change_bridge);
+		if (!conflict->bridge_has_one_vga) {
+			vga_irq_set_state(conflict, false);
+			flags |= PCI_VGA_STATE_CHANGE_DECODES;
+			if (lwants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
+				pci_bits |= PCI_COMMAND_MEMORY;
+			if (lwants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
+				pci_bits |= PCI_COMMAND_IO;
+		}
+
+		if (change_bridge)
+			flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
+
+		pci_set_vga_state(conflict->pdev, false, pci_bits, flags);
 		conflict->owns &= ~lwants;
 		/* If he also owned non-legacy, that is no longer the case */
 		if (lwants & VGA_RSRC_LEGACY_MEM)
@@ -261,14 +270,24 @@ enable_them:
 	 * also have in "decodes". We can lock resources we don't decode but
 	 * not own them.
 	 */
+	flags = 0;
 	pci_bits = 0;
-	if (wants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
-		pci_bits |= PCI_COMMAND_MEMORY;
-	if (wants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
-		pci_bits |= PCI_COMMAND_IO;
-	pci_set_vga_state(vgadev->pdev, true, pci_bits, !!(wants & VGA_RSRC_LEGACY_MASK));
 
-	vga_irq_set_state(vgadev, true);
+	if (!vgadev->bridge_has_one_vga) {
+		flags |= PCI_VGA_STATE_CHANGE_DECODES;
+		if (wants & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
+			pci_bits |= PCI_COMMAND_MEMORY;
+		if (wants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
+			pci_bits |= PCI_COMMAND_IO;
+	}
+	if (!!(wants & VGA_RSRC_LEGACY_MASK))
+		flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
+
+	pci_set_vga_state(vgadev->pdev, true, pci_bits, flags);
+
+	if (!vgadev->bridge_has_one_vga) {
+		vga_irq_set_state(vgadev, true);
+	}
 	vgadev->owns |= (wants & vgadev->decodes);
 lock_them:
 	vgadev->locks |= (rsrc & VGA_RSRC_LEGACY_MASK);
@@ -421,6 +440,62 @@ bail:
 }
 EXPORT_SYMBOL(vga_put);
 
+/* Rules for using a bridge to control a VGA descendant decoding:
+   if a bridge has only one VGA descendant then it can be used
+   to control the VGA routing for that device.
+   It should always use the bridge closest to the device to control it.
+   If a bridge has a direct VGA descendant, but also have a sub-bridge
+   VGA descendant then we cannot use that bridge to control the direct VGA descendant.
+   So for every device we register, we need to iterate all its parent bridges
+   so we can invalidate any devices using them properly.
+*/
+static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
+{
+	struct vga_device *same_bridge_vgadev;
+	struct pci_bus *new_bus, *bus;
+	struct pci_dev *new_bridge, *bridge;
+
+	vgadev->bridge_has_one_vga = true;
+
+	if (list_empty(&vga_list))
+		return;
+
+	/* okay iterate the new devices bridge hierarachy */
+	new_bus = vgadev->pdev->bus;
+	while (new_bus) {
+		new_bridge = new_bus->self;
+
+		if (new_bridge) {
+			/* go through list of devices already registered */
+			list_for_each_entry(same_bridge_vgadev, &vga_list, list) {
+				bus = same_bridge_vgadev->pdev->bus;
+				bridge = bus->self;
+
+				/* see if the share a bridge with this device */
+				if (new_bridge == bridge) {
+					/* if their direct parent bridge is the same
+					   as any bridge of this device then it can't be used
+					   for that device */
+					same_bridge_vgadev->bridge_has_one_vga = false;
+				}
+
+				/* now iterate the previous devices bridge hierarchy */
+				/* if the new devices parent bridge is in the other devices
+				   hierarchy then we can't use it to control this device */
+				while (bus) {
+					bridge = bus->self;
+					if (bridge) {
+						if (bridge == vgadev->pdev->bus->self)
+							vgadev->bridge_has_one_vga = false;
+					}
+					bus = bus->parent;
+				}
+			}
+		}
+		new_bus = new_bus->parent;
+	}
+}
+
 /*
  * Currently, we assume that the "initial" setup of the system is
  * not sane, that is we come up with conflicting devices and let
@@ -500,6 +575,8 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
 		vga_default = pci_dev_get(pdev);
 #endif
 
+	vga_arbiter_check_bridge_sharing(vgadev);
+
 	/* Add to the list */
 	list_add(&vgadev->list, &vga_list);
 	vga_count++;
@@ -1222,6 +1299,7 @@ static int __init vga_arb_device_init(void)
 {
 	int rc;
 	struct pci_dev *pdev;
+	struct vga_device *vgadev;
 
 	rc = misc_register(&vga_arb_device);
 	if (rc < 0)
@@ -1238,6 +1316,13 @@ static int __init vga_arb_device_init(void)
 		vga_arbiter_add_pci_device(pdev);
 
 	pr_info("vgaarb: loaded\n");
+
+	list_for_each_entry(vgadev, &vga_list, list) {
+		if (vgadev->bridge_has_one_vga)
+			pr_info("vgaarb: bridge control possible %s\n", pci_name(vgadev->pdev));
+		else
+			pr_info("vgaarb: no bridge control possible %s\n", pci_name(vgadev->pdev));
+	}
 	return rc;
 }
 subsys_initcall(vga_arb_device_init);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 710c8a2..a3b7f27 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2888,31 +2888,34 @@ static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode,
  * @dev: the PCI device
  * @decode: true = enable decoding, false = disable decoding
  * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
- * @change_bridge: traverse ancestors and change bridges
+ * @change_bridge_flags: traverse ancestors and change bridges
+ * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
  */
 int pci_set_vga_state(struct pci_dev *dev, bool decode,
-		      unsigned int command_bits, bool change_bridge)
+		      unsigned int command_bits, u32 flags)
 {
 	struct pci_bus *bus;
 	struct pci_dev *bridge;
 	u16 cmd;
 	int rc;
 
-	WARN_ON(command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY));
+	WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) && (command_bits & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)));
 
 	/* ARCH specific VGA enables */
-	rc = pci_set_vga_state_arch(dev, decode, command_bits, change_bridge);
+	rc = pci_set_vga_state_arch(dev, decode, command_bits, flags);
 	if (rc)
 		return rc;
 
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	if (decode == true)
-		cmd |= command_bits;
-	else
-		cmd &= ~command_bits;
-	pci_write_config_word(dev, PCI_COMMAND, cmd);
+	if (flags & PCI_VGA_STATE_CHANGE_DECODES) {
+		pci_read_config_word(dev, PCI_COMMAND, &cmd);
+		if (decode == true)
+			cmd |= command_bits;
+		else
+			cmd &= ~command_bits;
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+	}
 
-	if (change_bridge == false)
+	if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE))
 		return 0;
 
 	bus = dev->bus;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 7454408..9c0800f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -916,8 +916,11 @@ int pci_cfg_space_size_ext(struct pci_dev *dev);
 int pci_cfg_space_size(struct pci_dev *dev);
 unsigned char pci_bus_max_busnr(struct pci_bus *bus);
 
+#define PCI_VGA_STATE_CHANGE_BRIDGE (1 << 0)
+#define PCI_VGA_STATE_CHANGE_DECODES (1 << 1)
+
 int pci_set_vga_state(struct pci_dev *pdev, bool decode,
-		      unsigned int command_bits, bool change_bridge);
+		      unsigned int command_bits, u32 flags);
 /* kmem_cache style wrapper around pci_alloc_consistent() */
 
 #include <linux/pci-dma.h>
@@ -1047,7 +1050,7 @@ static inline int pci_proc_domain(struct pci_bus *bus)
 
 /* some architectures require additional setup to direct VGA traffic */
 typedef int (*arch_set_vga_state_t)(struct pci_dev *pdev, bool decode,
-		      unsigned int command_bits, bool change_bridge);
+		      unsigned int command_bits, u32 flags);
 extern void pci_register_set_vga_state(arch_set_vga_state_t func);
 
 #else /* CONFIG_PCI is not enabled */
