PCI fixes for 2.6.7-rc1

diff -Nru a/include/linux/pci_ids.h b/include/linux/pci_ids.h
@@ -1870,6 +1870,11 @@
 #define PCI_VENDOR_ID_ZOLTRIX		0x15b0
 #define PCI_DEVICE_ID_ZOLTRIX_2BD0	0x2bd0 
 
+#define PCI_VENDOR_ID_MELLANOX		0x15b3
+#define PCI_DEVICE_ID_MELLANOX_TAVOR	0x5a44
+#define PCI_DEVICE_ID_MELLANOX_ARBEL_COMPAT 0x6278
+#define PCI_DEVICE_ID_MELLANOX_ARBEL	0x6282
+
 #define PCI_VENDOR_ID_PDC		0x15e9
 #define PCI_DEVICE_ID_PDC_1841		0x1841
 

@@ -1890,6 +1895,8 @@
 #define PCI_VENDOR_ID_S2IO		0x17d5
 #define	PCI_DEVICE_ID_S2IO_WIN		0x5731
 #define	PCI_DEVICE_ID_S2IO_UNI		0x5831
+
+#define PCI_VENDOR_ID_TOPSPIN		0x1867
 
 #define PCI_VENDOR_ID_ARC               0x192E
 #define PCI_DEVICE_ID_ARC_EHCI          0x0101

diff -Nru a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
@@ -299,10 +299,30 @@
 {
 	struct pci_dev * pci_dev = to_pci_dev(dev);
 	struct pci_driver * drv = pci_dev->driver;
+	int i = 0;
 
 	if (drv && drv->suspend)
-		return drv->suspend(pci_dev,state);
-	return 0;
+		i = drv->suspend(pci_dev,state);
+		
+	pci_save_state(pci_dev, pci_dev->saved_config_space);
+	return i;
+}
+
+
+/* 
+ * Default resume method for devices that have no driver provided resume,
+ * or not even a driver at all.
+ */
+static void pci_default_resume(struct pci_dev *pci_dev)
+{
+	/* restore the PCI config space */
+	pci_restore_state(pci_dev, pci_dev->saved_config_space);
+	/* if the device was enabled before suspend, reenable */
+	if (pci_dev->is_enabled)
+		pci_enable_device(pci_dev);
+	/* if the device was busmaster before the suspend, make it busmaster again */
+	if (pci_dev->is_busmaster)
+		pci_set_master(pci_dev);
 }
 
 static int pci_device_resume(struct device * dev)

@@ -312,6 +332,8 @@
 
 	if (drv && drv->resume)
 		drv->resume(pci_dev);
+	else
+		pci_default_resume(pci_dev);
 	return 0;
 }
 

diff -Nru a/drivers/pci/pci.c b/drivers/pci/pci.c
@@ -385,6 +385,7 @@
 int
 pci_enable_device(struct pci_dev *dev)
 {
+	dev->is_enabled = 1;
 	return pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
 }
 

@@ -399,6 +400,9 @@
 pci_disable_device(struct pci_dev *dev)
 {
 	u16 pci_command;
+	
+	dev->is_enabled = 0;
+	dev->is_busmaster = 0;
 
 	pci_read_config_word(dev, PCI_COMMAND, &pci_command);
 	if (pci_command & PCI_COMMAND_MASTER) {

@@ -601,6 +605,7 @@
 		cmd |= PCI_COMMAND_MASTER;
 		pci_write_config_word(dev, PCI_COMMAND, cmd);
 	}
+	dev->is_busmaster = 1;
 	pcibios_set_master(dev);
 }
 

diff -Nru a/include/linux/pci.h b/include/linux/pci.h
@@ -488,6 +488,11 @@
 	/* These fields are used by common fixups */
 	unsigned int	transparent:1;	/* Transparent PCI bridge */
 	unsigned int	multifunction:1;/* Part of multi-function device */
+	/* keep track of device state */
+	unsigned int	is_enabled:1;	/* pci_enable_device has been called */
+	unsigned int	is_busmaster:1; /* device is busmaster */
+	
+	unsigned int 	saved_config_space[16]; /* config space saved at suspend time */
 #ifdef CONFIG_PCI_NAMES
 #define PCI_NAME_SIZE	96
 #define PCI_NAME_HALF	__stringify(43)	/* less than half to handle slop */

diff -Nru a/include/linux/pci_ids.h b/include/linux/pci_ids.h
@@ -1910,6 +1910,8 @@
 #define	PCI_DEVICE_ID_S2IO_WIN		0x5731
 #define	PCI_DEVICE_ID_S2IO_UNI		0x5831
 
+#define PCI_VENDOR_ID_INFINICON		0x1820
+
 #define PCI_VENDOR_ID_TOPSPIN		0x1867
 
 #define PCI_VENDOR_ID_ARC               0x192E

diff -Nru a/drivers/pci/probe.c b/drivers/pci/probe.c
@@ -366,6 +366,8 @@
 			return max;
 		busnr = (buses >> 8) & 0xFF;
 		child = pci_alloc_child_bus(bus, dev, busnr);
+		if (!child)
+			return max;
 		child->primary = buses & 0xFF;
 		child->subordinate = (buses >> 16) & 0xFF;
 		child->bridge_ctl = bctl;