Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…

…/git/jbarnes/pci-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  PCI PM: make the PM core more careful with drivers using the new PM framework
  PCI PM: Read power state from device after trying to change it on resume
  PCI PM: Do not disable and enable bridges during suspend-resume
  PCI: PCIe portdrv: Simplify suspend and resume
  PCI PM: Fix saving of device state in pci_legacy_suspend
  PCI PM: Check if the state has been saved before trying to restore it
  PCI PM: Fix handling of devices without drivers
  PCI: return error on failure to read PCI ROMs
  PCI: properly clean up ASPM link state on device remove

Documentation/filesystems/sysfs-pci.txt

@@ -9,6 +9,7 @@ that support it.  For example, a given bus might look like this:
      |   |-- class
      |   |-- config
      |   |-- device
+     |   |-- enable
      |   |-- irq
      |   |-- local_cpus
      |   |-- resource
@@ -32,6 +33,7 @@ files, each with their own function.
        class		   PCI class (ascii, ro)
        config		   PCI config space (binary, rw)
        device		   PCI device (ascii, ro)
+       enable	           Whether the device is enabled (ascii, rw)
        irq		   IRQ number (ascii, ro)
        local_cpus	   nearby CPU mask (cpumask, ro)
        resource		   PCI resource host addresses (ascii, ro)
@@ -57,10 +59,19 @@ used to do actual device programming from userspace.  Note that some platforms
 don't support mmapping of certain resources, so be sure to check the return
 value from any attempted mmap.
 
+The 'enable' file provides a counter that indicates how many times the device 
+has been enabled.  If the 'enable' file currently returns '4', and a '1' is
+echoed into it, it will then return '5'.  Echoing a '0' into it will decrease
+the count.  Even when it returns to 0, though, some of the initialisation
+may not be reversed.  
+
 The 'rom' file is special in that it provides read-only access to the device's
 ROM file, if available.  It's disabled by default, however, so applications
 should write the string "1" to the file to enable it before attempting a read
-call, and disable it following the access by writing "0" to the file.
+call, and disable it following the access by writing "0" to the file.  Note
+that the device must be enabled for a rom read to return data succesfully.
+In the event a driver is not bound to the device, it can be enabled using the
+'enable' file, documented above.
 
 Accessing legacy resources through sysfs
 ----------------------------------------

arch/ia64/sn/kernel/io_acpi_init.c

@@ -443,7 +443,7 @@ sn_acpi_slot_fixup(struct pci_dev *dev)
 		size = pci_resource_len(dev, PCI_ROM_RESOURCE);
 		addr = ioremap(pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE],
 			       size);
-		image_size = pci_get_rom_size(addr, size);
+		image_size = pci_get_rom_size(dev, addr, size);
 		dev->resource[PCI_ROM_RESOURCE].start = (unsigned long) addr;
 		dev->resource[PCI_ROM_RESOURCE].end =
 					(unsigned long) addr + image_size - 1;

arch/ia64/sn/kernel/io_init.c

@@ -269,7 +269,7 @@ sn_io_slot_fixup(struct pci_dev *dev)
 
 			rom = ioremap(pci_resource_start(dev, PCI_ROM_RESOURCE),
 				      size + 1);
-			image_size = pci_get_rom_size(rom, size + 1);
+			image_size = pci_get_rom_size(dev, rom, size + 1);
 			dev->resource[PCI_ROM_RESOURCE].end =
 				dev->resource[PCI_ROM_RESOURCE].start +
 				image_size - 1;

drivers/pci/pci-driver.c

@@ -355,6 +355,8 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state)
 	int i = 0;
 
 	if (drv && drv->suspend) {
+		pci_power_t prev = pci_dev->current_state;
+
 		pci_dev->state_saved = false;
 
 		i = drv->suspend(pci_dev, state);
@@ -365,12 +367,16 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state)
 		if (pci_dev->state_saved)
 			goto Fixup;
 
-		if (WARN_ON_ONCE(pci_dev->current_state != PCI_D0))
+		if (pci_dev->current_state != PCI_D0
+		    && pci_dev->current_state != PCI_UNKNOWN) {
+			WARN_ONCE(pci_dev->current_state != prev,
+				"PCI PM: Device state not saved by %pF\n",
+				drv->suspend);
 			goto Fixup;
+		}
 	}
 
 	pci_save_state(pci_dev);
-	pci_dev->state_saved = true;
 	/*
 	 * This is for compatibility with existing code with legacy PM support.
 	 */
@@ -424,35 +430,20 @@ static void pci_pm_default_resume_noirq(struct pci_dev *pci_dev)
 	pci_fixup_device(pci_fixup_resume_early, pci_dev);
 }
 
-static int pci_pm_default_resume(struct pci_dev *pci_dev)
+static void pci_pm_default_resume(struct pci_dev *pci_dev)
 {
 	pci_fixup_device(pci_fixup_resume, pci_dev);
 
 	if (!pci_is_bridge(pci_dev))
 		pci_enable_wake(pci_dev, PCI_D0, false);
-
-	return pci_pm_reenable_device(pci_dev);
-}
-
-static void pci_pm_default_suspend_generic(struct pci_dev *pci_dev)
-{
-	/* If device is enabled at this point, disable it */
-	pci_disable_enabled_device(pci_dev);
-	/*
-	 * Save state with interrupts enabled, because in principle the bus the
-	 * device is on may be put into a low power state after this code runs.
-	 */
-	pci_save_state(pci_dev);
 }
 
 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
 {
-	pci_pm_default_suspend_generic(pci_dev);
-
+	/* Disable non-bridge devices without PM support */
 	if (!pci_is_bridge(pci_dev))
-		pci_prepare_to_sleep(pci_dev);
-
-	pci_fixup_device(pci_fixup_suspend, pci_dev);
+		pci_disable_enabled_device(pci_dev);
+	pci_save_state(pci_dev);
 }
 
 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
@@ -497,21 +488,49 @@ static void pci_pm_complete(struct device *dev)
 static int pci_pm_suspend(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct device_driver *drv = dev->driver;
-	int error = 0;
+	struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_SUSPEND);
 
-	if (drv && drv->pm && drv->pm->suspend) {
-		error = drv->pm->suspend(dev);
-		suspend_report_result(drv->pm->suspend, error);
+	if (!pm) {
+		pci_pm_default_suspend(pci_dev);
+		goto Fixup;
 	}
 
-	if (!error)
-		pci_pm_default_suspend(pci_dev);
+	pci_dev->state_saved = false;
 
-	return error;
+	if (pm->suspend) {
+		pci_power_t prev = pci_dev->current_state;
+		int error;
+
+		error = pm->suspend(dev);
+		suspend_report_result(pm->suspend, error);
+		if (error)
+			return error;
+
+		if (pci_dev->state_saved)
+			goto Fixup;
+
+		if (pci_dev->current_state != PCI_D0
+		    && pci_dev->current_state != PCI_UNKNOWN) {
+			WARN_ONCE(pci_dev->current_state != prev,
+				"PCI PM: State of device not saved by %pF\n",
+				pm->suspend);
+			goto Fixup;
+		}
+	}
+
+	if (!pci_dev->state_saved) {
+		pci_save_state(pci_dev);
+		if (!pci_is_bridge(pci_dev))
+			pci_prepare_to_sleep(pci_dev);
+	}
+
+ Fixup:
+	pci_fixup_device(pci_fixup_suspend, pci_dev);
+
+	return 0;
 }
 
 static int pci_pm_suspend_noirq(struct device *dev)
@@ -554,7 +573,7 @@ static int pci_pm_resume_noirq(struct device *dev)
 static int pci_pm_resume(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct device_driver *drv = dev->driver;
+	struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int error = 0;
 
 	/*
@@ -567,12 +586,16 @@ static int pci_pm_resume(struct device *dev)
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume(dev);
 
-	error = pci_pm_default_resume(pci_dev);
+	pci_pm_default_resume(pci_dev);
 
-	if (!error && drv && drv->pm && drv->pm->resume)
-		error = drv->pm->resume(dev);
+	if (pm) {
+		if (pm->resume)
+			error = pm->resume(dev);
+	} else {
+		pci_pm_reenable_device(pci_dev);
+	}
 
-	return error;
+	return 0;
 }
 
 #else /* !CONFIG_SUSPEND */
@@ -589,21 +612,31 @@ static int pci_pm_resume(struct device *dev)
 static int pci_pm_freeze(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct device_driver *drv = dev->driver;
-	int error = 0;
+	struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_FREEZE);
 
-	if (drv && drv->pm && drv->pm->freeze) {
-		error = drv->pm->freeze(dev);
-		suspend_report_result(drv->pm->freeze, error);
+	if (!pm) {
+		pci_pm_default_suspend(pci_dev);
+		return 0;
 	}
 
-	if (!error)
-		pci_pm_default_suspend_generic(pci_dev);
+	pci_dev->state_saved = false;
 
-	return error;
+	if (pm->freeze) {
+		int error;
+
+		error = pm->freeze(dev);
+		suspend_report_result(pm->freeze, error);
+		if (error)
+			return error;
+	}
+
+	if (!pci_dev->state_saved)
+		pci_save_state(pci_dev);
+
+	return 0;
 }
 
 static int pci_pm_freeze_noirq(struct device *dev)
@@ -646,39 +679,48 @@ static int pci_pm_thaw_noirq(struct device *dev)
 static int pci_pm_thaw(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct device_driver *drv = dev->driver;
+	struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int error = 0;
 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume(dev);
 
-	pci_pm_reenable_device(pci_dev);
-
-	if (drv && drv->pm && drv->pm->thaw)
-		error =  drv->pm->thaw(dev);
+	if (pm) {
+		if (pm->thaw)
+			error = pm->thaw(dev);
+	} else {
+		pci_pm_reenable_device(pci_dev);
+	}
 
 	return error;
 }
 
 static int pci_pm_poweroff(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct device_driver *drv = dev->driver;
+	struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int error = 0;
 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend(dev, PMSG_HIBERNATE);
 
-	if (!drv || !drv->pm)
-		return 0;
+	if (!pm) {
+		pci_pm_default_suspend(pci_dev);
+		goto Fixup;
+	}
+
+	pci_dev->state_saved = false;
 
-	if (drv->pm->poweroff) {
-		error = drv->pm->poweroff(dev);
-		suspend_report_result(drv->pm->poweroff, error);
+	if (pm->poweroff) {
+		error = pm->poweroff(dev);
+		suspend_report_result(pm->poweroff, error);
 	}
 
-	if (!error)
-		pci_pm_default_suspend(pci_dev);
+	if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
+		pci_prepare_to_sleep(pci_dev);
+
+ Fixup:
+	pci_fixup_device(pci_fixup_suspend, pci_dev);
 
 	return error;
 }
@@ -719,7 +761,7 @@ static int pci_pm_restore_noirq(struct device *dev)
 static int pci_pm_restore(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	struct device_driver *drv = dev->driver;
+	struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int error = 0;
 
 	/*
@@ -732,10 +774,14 @@ static int pci_pm_restore(struct device *dev)
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume(dev);
 
-	error = pci_pm_default_resume(pci_dev);
+	pci_pm_default_resume(pci_dev);
 
-	if (!error && drv && drv->pm && drv->pm->restore)
-		error = drv->pm->restore(dev);
+	if (pm) {
+		if (pm->restore)
+			error = pm->restore(dev);
+	} else {
+		pci_pm_reenable_device(pci_dev);
+	}
 
 	return error;
 }

drivers/pci/pci-sysfs.c

@@ -768,8 +768,8 @@ pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
 		return -EINVAL;
 
 	rom = pci_map_rom(pdev, &size);	/* size starts out as PCI window size */
-	if (!rom)
-		return 0;
+	if (!rom || !size)
+		return -EIO;
 
 	if (off >= size)
 		count = 0;

drivers/pci/pci.c

@@ -1418,10 +1418,10 @@ int pci_restore_standard_config(struct pci_dev *dev)
 		break;
 	}
 
-	dev->current_state = PCI_D0;
+	pci_update_current_state(dev, PCI_D0);
 
  Restore:
-	return pci_restore_state(dev);
+	return dev->state_saved ? pci_restore_state(dev) : 0;
 }
 
 /**

drivers/pci/pcie/aspm.c

@@ -718,9 +718,9 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev)
 
 	/*
 	 * All PCIe functions are in one slot, remove one function will remove
-	 * the the whole slot, so just wait
+	 * the whole slot, so just wait until we are the last function left.
 	 */
-	if (!list_empty(&parent->subordinate->devices))
+	if (!list_is_last(&pdev->bus_list, &parent->subordinate->devices))
 		goto out;
 
 	/* All functions are removed, so just disable ASPM for the link */