[PATCH] Fix VIA quirks

Fix VIA quirks that were recently broken by Alan Cox in the upstream
kernel (commit 1597cacb).

My understanding is that pci_find_present() doesn't work yet at the time
the quirks are run.  So I used a two-step quirk as is done for some other
quirks already.  First we detect the VIA south bridges and set the right
low and high device limits, then we are ready to actually run the quirks on
the affected devices.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/pci/quirks.c

@@ -654,19 +654,40 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686_4,	quirk_vi
  *	VIA bridges which have VLink
  */
 
-static const struct pci_device_id via_vlink_fixup_tbl[] = {
-	/* Internal devices need IRQ line routing, pre VLink */
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C686), 0 },
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8231), 17 },
-	/* Devices with VLink */
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8233_0), 17},
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8233A), 17 },
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8233C_0), 17 },
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8235), 16 },
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8237), 15 },
-	{ PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8237A), 15 },
-	{ 0, },
-};
+static int via_vlink_dev_lo = -1, via_vlink_dev_hi = 18;
+
+static void quirk_via_bridge(struct pci_dev *dev)
+{
+	/* See what bridge we have and find the device ranges */
+	switch (dev->device) {
+	case PCI_DEVICE_ID_VIA_82C686:
+		/* 82C686 is special */
+		via_vlink_dev_lo = 7;
+		via_vlink_dev_hi = 7;
+		break;
+	case PCI_DEVICE_ID_VIA_8237:
+	case PCI_DEVICE_ID_VIA_8237A:
+		via_vlink_dev_lo = 15;
+		break;
+	case PCI_DEVICE_ID_VIA_8235:
+		via_vlink_dev_lo = 16;
+		break;
+	case PCI_DEVICE_ID_VIA_8231:
+	case PCI_DEVICE_ID_VIA_8233_0:
+	case PCI_DEVICE_ID_VIA_8233A:
+	case PCI_DEVICE_ID_VIA_8233C_0:
+		via_vlink_dev_lo = 17;
+		break;
+	}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686,	quirk_via_bridge);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8231,		quirk_via_bridge);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8233_0,	quirk_via_bridge);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8233A,	quirk_via_bridge);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8233C_0,	quirk_via_bridge);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8235,		quirk_via_bridge);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8237,		quirk_via_bridge);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8237A,	quirk_via_bridge);
 
 /**
  *	quirk_via_vlink		-	VIA VLink IRQ number update
@@ -675,35 +696,20 @@ static const struct pci_device_id via_vlink_fixup_tbl[] = {
  *	If the device we are dealing with is on a PIC IRQ we need to
  *	ensure that the IRQ line register which usually is not relevant
  *	for PCI cards, is actually written so that interrupts get sent
- *	to the right place
+ *	to the right place.
+ *	We only do this on systems where a VIA south bridge was detected,
+ *	and only for VIA devices on the motherboard (see quirk_via_bridge
+ *	above).
  */
 
 static void quirk_via_vlink(struct pci_dev *dev)
 {
-	const struct pci_device_id *via_vlink_fixup;
-	static int dev_lo = -1, dev_hi = 18;
 	u8 irq, new_irq;
 
-	/* Check if we have VLink and cache the result */
-
-	/* Checked already - no */
-	if (dev_lo == -2)
+	/* Check if we have VLink at all */
+	if (via_vlink_dev_lo == -1)
 		return;
 
-	/* Not checked - see what bridge we have and find the device
-	   ranges */
-
-	if (dev_lo == -1) {
-		via_vlink_fixup = pci_find_present(via_vlink_fixup_tbl);
-		if (via_vlink_fixup == NULL) {
-			dev_lo = -2;
-			return;
-		}
-		dev_lo = via_vlink_fixup->driver_data;
-		/* 82C686 is special - 0/0 */
-		if (dev_lo == 0)
-			dev_hi = 0;
-	}
 	new_irq = dev->irq;
 
 	/* Don't quirk interrupts outside the legacy IRQ range */
@@ -711,8 +717,8 @@ static void quirk_via_vlink(struct pci_dev *dev)
 		return;
 
 	/* Internal device ? */
-	if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) > dev_hi ||
-		PCI_SLOT(dev->devfn) < dev_lo)
+	if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) > via_vlink_dev_hi ||
+	    PCI_SLOT(dev->devfn) < via_vlink_dev_lo)
 		return;
 
 	/* This is an internal VLink device on a PIC interrupt. The BIOS