Merge branch 'linus' into x86/threadinfo

10 files changed, 187 insertions, 92 deletions

diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index 99e5a68..fae55a3 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -156,6 +156,10 @@ static struct attribute *ep_dev_attrs[] = {
 static struct attribute_group ep_dev_attr_grp = {
 	.attrs = ep_dev_attrs,
 };
+static struct attribute_group *ep_dev_groups[] = {
+	&ep_dev_attr_grp,
+	NULL
+};
 
 static int usb_endpoint_major_init(void)
 {
@@ -298,6 +302,7 @@ int usb_create_ep_files(struct device *parent,
 
 	ep_dev->desc = &endpoint->desc;
 	ep_dev->udev = udev;
+	ep_dev->dev.groups = ep_dev_groups;
 	ep_dev->dev.devt = MKDEV(usb_endpoint_major, ep_dev->minor);
 	ep_dev->dev.class = ep_class->class;
 	ep_dev->dev.parent = parent;
@@ -309,9 +314,6 @@ int usb_create_ep_files(struct device *parent,
 	retval = device_register(&ep_dev->dev);
 	if (retval)
 		goto error_chrdev;
-	retval = sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
-	if (retval)
-		goto error_group;
 
 	/* create the symlink to the old-style "ep_XX" directory */
 	sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
@@ -322,8 +324,6 @@ int usb_create_ep_files(struct device *parent,
 	return retval;
 
 error_link:
-	sysfs_remove_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
-error_group:
 	device_unregister(&ep_dev->dev);
 	destroy_endpoint_class();
 	return retval;
@@ -348,7 +348,6 @@ void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
 
 		sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
 		sysfs_remove_link(&ep_dev->dev.parent->kobj, name);
-		sysfs_remove_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
 		device_unregister(&ep_dev->dev);
 		endpoint->ep_dev = NULL;
 		destroy_endpoint_class();
diff --git a/drivers/usb/core/generic.c b/drivers/usb/core/generic.c
index c1cb94e..7e912f2 100644
--- a/drivers/usb/core/generic.c
+++ b/drivers/usb/core/generic.c
@@ -155,9 +155,6 @@ static int generic_probe(struct usb_device *udev)
 {
 	int err, c;
 
-	/* put device-specific files into sysfs */
-	usb_create_sysfs_dev_files(udev);
-
 	/* Choose and set the configuration.  This registers the interfaces
 	 * with the driver core and lets interface drivers bind to them.
 	 */
@@ -189,8 +186,6 @@ static void generic_disconnect(struct usb_device *udev)
 	 * unconfigure the device */
 	if (udev->actconfig)
 		usb_set_configuration(udev, -1);
-
-	usb_remove_sysfs_dev_files(udev);
 }
 
 #ifdef	CONFIG_PM
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index bf10e9c..09a53e7 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -818,12 +818,12 @@ static int usb_register_bus(struct usb_bus *bus)
 	set_bit (busnum, busmap.busmap);
 	bus->busnum = busnum;
 
-	bus->dev = device_create(usb_host_class, bus->controller, MKDEV(0, 0),
-				 "usb_host%d", busnum);
+	bus->dev = device_create_drvdata(usb_host_class, bus->controller,
+					 MKDEV(0, 0), bus,
+					 "usb_host%d", busnum);
 	result = PTR_ERR(bus->dev);
 	if (IS_ERR(bus->dev))
 		goto error_create_class_dev;
-	dev_set_drvdata(bus->dev, bus);
 
 	/* Add it to the local list of buses */
 	list_add (&bus->bus_list, &usb_bus_list);
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 1e4b81e..a0bf5df 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -213,6 +213,8 @@ struct hc_driver {
 
 		/* force handover of high-speed port to full-speed companion */
 	void	(*relinquish_port)(struct usb_hcd *, int);
+		/* has a port been handed over to a companion? */
+	int	(*port_handed_over)(struct usb_hcd *, int);
 };
 
 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index eb57fcc..94789be 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -644,6 +644,48 @@ static void hub_stop(struct usb_hub *hub)
 
 #ifdef CONFIG_PM
 
+/* Try to identify which devices need USB-PERSIST handling */
+static int persistent_device(struct usb_device *udev)
+{
+	int i;
+	int retval;
+	struct usb_host_config *actconfig;
+
+	/* Explicitly not marked persistent? */
+	if (!udev->persist_enabled)
+		return 0;
+
+	/* No active config? */
+	actconfig = udev->actconfig;
+	if (!actconfig)
+		return 0;
+
+	/* FIXME! We should check whether it's open here or not! */
+
+	/*
+	 * Check that all the interface drivers have a
+	 * 'reset_resume' entrypoint
+	 */
+	retval = 0;
+	for (i = 0; i < actconfig->desc.bNumInterfaces; i++) {
+		struct usb_interface *intf;
+		struct usb_driver *driver;
+
+		intf = actconfig->interface[i];
+		if (!intf->dev.driver)
+			continue;
+		driver = to_usb_driver(intf->dev.driver);
+		if (!driver->reset_resume)
+			return 0;
+		/*
+		 * We have at least one driver, and that one
+		 * has a reset_resume method.
+		 */
+		retval = 1;
+	}
+	return retval;
+}
+
 static void hub_restart(struct usb_hub *hub, int type)
 {
 	struct usb_device *hdev = hub->hdev;
@@ -689,8 +731,8 @@ static void hub_restart(struct usb_hub *hub, int type)
 		 * turn off the various status changes to prevent
 		 * khubd from disconnecting it later.
 		 */
-		if (udev->persist_enabled && status == 0 &&
-				!(portstatus & USB_PORT_STAT_ENABLE)) {
+		if (status == 0 && !(portstatus & USB_PORT_STAT_ENABLE) &&
+				persistent_device(udev)) {
 			if (portchange & USB_PORT_STAT_C_ENABLE)
 				clear_port_feature(hub->hdev, port1,
 						USB_PORT_FEAT_C_ENABLE);
@@ -1326,6 +1368,12 @@ void usb_disconnect(struct usb_device **pdev)
 
 	usb_unlock_device(udev);
 
+	/* Remove the device-specific files from sysfs.  This must be
+	 * done with udev unlocked, because some of the attribute
+	 * routines try to acquire the device lock.
+	 */
+	usb_remove_sysfs_dev_files(udev);
+
 	/* Unregister the device.  The device driver is responsible
 	 * for removing the device files from usbfs and sysfs and for
 	 * de-configuring the device.
@@ -1541,6 +1589,9 @@ int usb_new_device(struct usb_device *udev)
 		goto fail;
 	}
 
+	/* put device-specific files into sysfs */
+	usb_create_sysfs_dev_files(udev);
+
 	/* Tell the world! */
 	announce_device(udev);
 	return err;
@@ -2744,7 +2795,11 @@ loop:
 		if ((status == -ENOTCONN) || (status == -ENOTSUPP))
 			break;
 	}
-	dev_err(hub_dev, "unable to enumerate USB device on port %d\n", port1);
+	if (hub->hdev->parent ||
+			!hcd->driver->port_handed_over ||
+			!(hcd->driver->port_handed_over)(hcd, port1))
+		dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
+				port1);
  
 done:
 	hub_port_disable(hub, port1, 1);
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 3e69266..fe47d14 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1607,6 +1607,7 @@ free_interfaces:
 		intf->dev.driver = NULL;
 		intf->dev.bus = &usb_bus_type;
 		intf->dev.type = &usb_if_device_type;
+		intf->dev.groups = usb_interface_groups;
 		intf->dev.dma_mask = dev->dev.dma_mask;
 		device_initialize(&intf->dev);
 		mark_quiesced(intf);
diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 2e20193..c070b34 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -47,6 +47,13 @@ static const struct usb_device_id usb_quirk_list[] = {
 	/* Edirol SD-20 */
 	{ USB_DEVICE(0x0582, 0x0027), .driver_info = USB_QUIRK_RESET_RESUME },
 
+	/* appletouch */
+	{ USB_DEVICE(0x05ac, 0x021a), .driver_info = USB_QUIRK_RESET_RESUME },
+
+	/* Avision AV600U */
+	{ USB_DEVICE(0x0638, 0x0a13), .driver_info =
+	  USB_QUIRK_STRING_FETCH_255 },
+
 	/* M-Systems Flash Disk Pioneers */
 	{ USB_DEVICE(0x08ec, 0x1000), .driver_info = USB_QUIRK_RESET_RESUME },
 
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 5b20a60..5e1f5d5 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -538,6 +538,46 @@ static struct attribute_group dev_attr_grp = {
 	.attrs = dev_attrs,
 };
 
+/* When modifying this list, be sure to modify dev_string_attrs_are_visible()
+ * accordingly.
+ */
+static struct attribute *dev_string_attrs[] = {
+	&dev_attr_manufacturer.attr,
+	&dev_attr_product.attr,
+	&dev_attr_serial.attr,
+	NULL
+};
+
+static mode_t dev_string_attrs_are_visible(struct kobject *kobj,
+		struct attribute *a, int n)
+{
+	struct usb_device *udev = to_usb_device(
+			container_of(kobj, struct device, kobj));
+
+	if (a == &dev_attr_manufacturer.attr) {
+		if (udev->manufacturer == NULL)
+			return 0;
+	} else if (a == &dev_attr_product.attr) {
+		if (udev->product == NULL)
+			return 0;
+	} else if (a == &dev_attr_serial.attr) {
+		if (udev->serial == NULL)
+			return 0;
+	}
+	return a->mode;
+}
+
+static struct attribute_group dev_string_attr_grp = {
+	.attrs =	dev_string_attrs,
+	.is_visible =	dev_string_attrs_are_visible,
+};
+
+struct attribute_group *usb_device_groups[] = {
+	&dev_attr_grp,
+	&dev_string_attr_grp,
+	NULL
+};
+
 /* Binary descriptors */
 
 static ssize_t
@@ -548,35 +588,33 @@ read_descriptors(struct kobject *kobj, struct bin_attribute *attr,
 			container_of(kobj, struct device, kobj));
 	size_t nleft = count;
 	size_t srclen, n;
+	int cfgno;
+	void *src;
 
-	usb_lock_device(udev);
-
-	/* The binary attribute begins with the device descriptor */
-	srclen = sizeof(struct usb_device_descriptor);
-	if (off < srclen) {
-		n = min_t(size_t, nleft, srclen - off);
-		memcpy(buf, off + (char *) &udev->descriptor, n);
-		nleft -= n;
-		buf += n;
-		off = 0;
-	} else {
-		off -= srclen;
-	}
-
-	/* Then follows the raw descriptor entry for the current
-	 * configuration (config plus subsidiary descriptors).
+	/* The binary attribute begins with the device descriptor.
+	 * Following that are the raw descriptor entries for all the
+	 * configurations (config plus subsidiary descriptors).
 	 */
-	if (udev->actconfig) {
-		int cfgno = udev->actconfig - udev->config;
-
-		srclen = __le16_to_cpu(udev->actconfig->desc.wTotalLength);
+	for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations &&
+			nleft > 0; ++cfgno) {
+		if (cfgno < 0) {
+			src = &udev->descriptor;
+			srclen = sizeof(struct usb_device_descriptor);
+		} else {
+			src = udev->rawdescriptors[cfgno];
+			srclen = __le16_to_cpu(udev->config[cfgno].desc.
+					wTotalLength);
+		}
 		if (off < srclen) {
-			n = min_t(size_t, nleft, srclen - off);
-			memcpy(buf, off + udev->rawdescriptors[cfgno], n);
+			n = min(nleft, srclen - (size_t) off);
+			memcpy(buf, src + off, n);
 			nleft -= n;
+			buf += n;
+			off = 0;
+		} else {
+			off -= srclen;
 		}
 	}
-	usb_unlock_device(udev);
 	return count - nleft;
 }
 
@@ -591,10 +629,9 @@ int usb_create_sysfs_dev_files(struct usb_device *udev)
 	struct device *dev = &udev->dev;
 	int retval;
 
-	retval = sysfs_create_group(&dev->kobj, &dev_attr_grp);
-	if (retval)
-		return retval;
-
+	/* Unforunately these attributes cannot be created before
+	 * the uevent is broadcast.
+	 */
 	retval = device_create_bin_file(dev, &dev_bin_attr_descriptors);
 	if (retval)
 		goto error;
@@ -607,21 +644,6 @@ int usb_create_sysfs_dev_files(struct usb_device *udev)
 	if (retval)
 		goto error;
 
-	if (udev->manufacturer) {
-		retval = device_create_file(dev, &dev_attr_manufacturer);
-		if (retval)
-			goto error;
-	}
-	if (udev->product) {
-		retval = device_create_file(dev, &dev_attr_product);
-		if (retval)
-			goto error;
-	}
-	if (udev->serial) {
-		retval = device_create_file(dev, &dev_attr_serial);
-		if (retval)
-			goto error;
-	}
 	retval = usb_create_ep_files(dev, &udev->ep0, udev);
 	if (retval)
 		goto error;
@@ -636,13 +658,9 @@ void usb_remove_sysfs_dev_files(struct usb_device *udev)
 	struct device *dev = &udev->dev;
 
 	usb_remove_ep_files(&udev->ep0);
-	device_remove_file(dev, &dev_attr_manufacturer);
-	device_remove_file(dev, &dev_attr_product);
-	device_remove_file(dev, &dev_attr_serial);
 	remove_power_attributes(dev);
 	remove_persist_attributes(dev);
 	device_remove_bin_file(dev, &dev_bin_attr_descriptors);
-	sysfs_remove_group(&dev->kobj, &dev_attr_grp);
 }
 
 /* Interface Accociation Descriptor fields */
@@ -688,17 +706,15 @@ static ssize_t show_interface_string(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct usb_interface *intf;
-	struct usb_device *udev;
-	int len;
+	char *string;
 
 	intf = to_usb_interface(dev);
-	udev = interface_to_usbdev(intf);
-	len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
-	if (len < 0)
+	string = intf->cur_altsetting->string;
+	barrier();		/* The altsetting might change! */
+
+	if (!string)
 		return 0;
-	buf[len] = '\n';
-	buf[len+1] = 0;
-	return len+1;
+	return sprintf(buf, "%s\n", string);
 }
 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
 
@@ -727,18 +743,6 @@ static ssize_t show_modalias(struct device *dev,
 }
 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 
-static struct attribute *intf_assoc_attrs[] = {
-	&dev_attr_iad_bFirstInterface.attr,
-	&dev_attr_iad_bInterfaceCount.attr,
-	&dev_attr_iad_bFunctionClass.attr,
-	&dev_attr_iad_bFunctionSubClass.attr,
-	&dev_attr_iad_bFunctionProtocol.attr,
-	NULL,
-};
-static struct attribute_group intf_assoc_attr_grp = {
-	.attrs = intf_assoc_attrs,
-};
-
 static struct attribute *intf_attrs[] = {
 	&dev_attr_bInterfaceNumber.attr,
 	&dev_attr_bAlternateSetting.attr,
@@ -753,6 +757,37 @@ static struct attribute_group intf_attr_grp = {
 	.attrs = intf_attrs,
 };
 
+static struct attribute *intf_assoc_attrs[] = {
+	&dev_attr_iad_bFirstInterface.attr,
+	&dev_attr_iad_bInterfaceCount.attr,
+	&dev_attr_iad_bFunctionClass.attr,
+	&dev_attr_iad_bFunctionSubClass.attr,
+	&dev_attr_iad_bFunctionProtocol.attr,
+	NULL,
+};
+
+static mode_t intf_assoc_attrs_are_visible(struct kobject *kobj,
+		struct attribute *a, int n)
+{
+	struct usb_interface *intf = to_usb_interface(
+			container_of(kobj, struct device, kobj));
+
+	if (intf->intf_assoc == NULL)
+		return 0;
+	return a->mode;
+}
+
+static struct attribute_group intf_assoc_attr_grp = {
+	.attrs =	intf_assoc_attrs,
+	.is_visible =	intf_assoc_attrs_are_visible,
+};
+
+struct attribute_group *usb_interface_groups[] = {
+	&intf_attr_grp,
+	&intf_assoc_attr_grp,
+	NULL
+};
+
 static inline void usb_create_intf_ep_files(struct usb_interface *intf,
 		struct usb_device *udev)
 {
@@ -777,23 +812,21 @@ static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
 
 int usb_create_sysfs_intf_files(struct usb_interface *intf)
 {
-	struct device *dev = &intf->dev;
 	struct usb_device *udev = interface_to_usbdev(intf);
 	struct usb_host_interface *alt = intf->cur_altsetting;
 	int retval;
 
 	if (intf->sysfs_files_created)
 		return 0;
-	retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
-	if (retval)
-		return retval;
 
+	/* The interface string may be present in some altsettings
+	 * and missing in others.  Hence its attribute cannot be created
+	 * before the uevent is broadcast.
+	 */
 	if (alt->string == NULL)
 		alt->string = usb_cache_string(udev, alt->desc.iInterface);
 	if (alt->string)
-		retval = device_create_file(dev, &dev_attr_interface);
-	if (intf->intf_assoc)
-		retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp);
+		retval = device_create_file(&intf->dev, &dev_attr_interface);
 	usb_create_intf_ep_files(intf, udev);
 	intf->sysfs_files_created = 1;
 	return 0;
@@ -807,7 +840,5 @@ void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 		return;
 	usb_remove_intf_ep_files(intf);
 	device_remove_file(dev, &dev_attr_interface);
-	sysfs_remove_group(&dev->kobj, &intf_attr_grp);
-	sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp);
 	intf->sysfs_files_created = 0;
 }
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 1f0db51..3257743 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -291,6 +291,7 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
 	device_initialize(&dev->dev);
 	dev->dev.bus = &usb_bus_type;
 	dev->dev.type = &usb_device_type;
+	dev->dev.groups = usb_device_groups;
 	dev->dev.dma_mask = bus->controller->dma_mask;
 	set_dev_node(&dev->dev, dev_to_node(bus->controller));
 	dev->state = USB_STATE_ATTACHED;
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 1bf8ccb..1a8bc21 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -130,6 +130,10 @@ static inline int is_active(const struct usb_interface *f)
 /* for labeling diagnostics */
 extern const char *usbcore_name;
 
+/* sysfs stuff */
+extern struct attribute_group *usb_device_groups[];
+extern struct attribute_group *usb_interface_groups[];
+
 /* usbfs stuff */
 extern struct mutex usbfs_mutex;
 extern struct usb_driver usbfs_driver;