[PATCH] USB: always export interface information for modalias

This fixes a problem with some cdc acm devices that were not getting
automatically loaded as the module alias was not being reported
properly.

This check was for back in the days when we only reported hotplug events
for the main usb device, not the interfaces.  We should always give the
interface information for MODALIAS/modalias as it can be needed.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 37 insertions, 61 deletions

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index eae413b..4bdbc9d 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -462,30 +462,23 @@ static ssize_t show_modalias(struct device *dev, struct device_attribute *attr,
 {
 	struct usb_interface *intf;
 	struct usb_device *udev;
-	int len;
+	struct usb_host_interface *alt;
 
 	intf = to_usb_interface(dev);
 	udev = interface_to_usbdev(intf);
-
-	len = sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic",
-			       le16_to_cpu(udev->descriptor.idVendor),
-			       le16_to_cpu(udev->descriptor.idProduct),
-			       le16_to_cpu(udev->descriptor.bcdDevice),
-			       udev->descriptor.bDeviceClass,
-			       udev->descriptor.bDeviceSubClass,
-			       udev->descriptor.bDeviceProtocol);
-	buf += len;
-
-	if (udev->descriptor.bDeviceClass == 0) {
-		struct usb_host_interface *alt = intf->cur_altsetting;
-
-		return len + sprintf(buf, "%02Xisc%02Xip%02X\n",
-			       alt->desc.bInterfaceClass,
-			       alt->desc.bInterfaceSubClass,
-			       alt->desc.bInterfaceProtocol);
- 	} else {
-		return len + sprintf(buf, "*isc*ip*\n");
-	}
+	alt = intf->cur_altsetting;
+
+	return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X"
+			"ic%02Xisc%02Xip%02X\n",
+			le16_to_cpu(udev->descriptor.idVendor),
+			le16_to_cpu(udev->descriptor.idProduct),
+			le16_to_cpu(udev->descriptor.bcdDevice),
+			udev->descriptor.bDeviceClass,
+			udev->descriptor.bDeviceSubClass,
+			udev->descriptor.bDeviceProtocol,
+			alt->desc.bInterfaceClass,
+			alt->desc.bInterfaceSubClass,
+			alt->desc.bInterfaceProtocol);
 }
 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
 
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 2493e7d..4eca490 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -569,6 +569,7 @@ static int usb_hotplug (struct device *dev, char **envp, int num_envp,
 {
 	struct usb_interface *intf;
 	struct usb_device *usb_dev;
+	struct usb_host_interface *alt;
 	int i = 0;
 	int length = 0;
 
@@ -585,7 +586,8 @@ static int usb_hotplug (struct device *dev, char **envp, int num_envp,
 
 	intf = to_usb_interface(dev);
 	usb_dev = interface_to_usbdev (intf);
-	
+	alt = intf->cur_altsetting;
+
 	if (usb_dev->devnum < 0) {
 		pr_debug ("usb %s: already deleted?\n", dev->bus_id);
 		return -ENODEV;
@@ -627,46 +629,27 @@ static int usb_hotplug (struct device *dev, char **envp, int num_envp,
 				usb_dev->descriptor.bDeviceProtocol))
 		return -ENOMEM;
 
-	if (usb_dev->descriptor.bDeviceClass == 0) {
-		struct usb_host_interface *alt = intf->cur_altsetting;
+	if (add_hotplug_env_var(envp, num_envp, &i,
+				buffer, buffer_size, &length,
+				"INTERFACE=%d/%d/%d",
+				alt->desc.bInterfaceClass,
+				alt->desc.bInterfaceSubClass,
+				alt->desc.bInterfaceProtocol))
+		return -ENOMEM;
 
-		/* 2.4 only exposed interface zero.  in 2.5, hotplug
-		 * agents are called for all interfaces, and can use
-		 * $DEVPATH/bInterfaceNumber if necessary.
-		 */
-		if (add_hotplug_env_var(envp, num_envp, &i,
-					buffer, buffer_size, &length,
-					"INTERFACE=%d/%d/%d",
-					alt->desc.bInterfaceClass,
-					alt->desc.bInterfaceSubClass,
-					alt->desc.bInterfaceProtocol))
-			return -ENOMEM;
-
-		if (add_hotplug_env_var(envp, num_envp, &i,
-					buffer, buffer_size, &length,
-					"MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X",
-					le16_to_cpu(usb_dev->descriptor.idVendor),
-					le16_to_cpu(usb_dev->descriptor.idProduct),
-					le16_to_cpu(usb_dev->descriptor.bcdDevice),
-					usb_dev->descriptor.bDeviceClass,
-					usb_dev->descriptor.bDeviceSubClass,
-					usb_dev->descriptor.bDeviceProtocol,
-					alt->desc.bInterfaceClass,
-					alt->desc.bInterfaceSubClass,
-					alt->desc.bInterfaceProtocol))
-			return -ENOMEM;
- 	} else {
-		if (add_hotplug_env_var(envp, num_envp, &i,
-					buffer, buffer_size, &length,
-					"MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic*isc*ip*",
-					le16_to_cpu(usb_dev->descriptor.idVendor),
-					le16_to_cpu(usb_dev->descriptor.idProduct),
-					le16_to_cpu(usb_dev->descriptor.bcdDevice),
-					usb_dev->descriptor.bDeviceClass,
-					usb_dev->descriptor.bDeviceSubClass,
-					usb_dev->descriptor.bDeviceProtocol))
-			return -ENOMEM;
-	}
+	if (add_hotplug_env_var(envp, num_envp, &i,
+				buffer, buffer_size, &length,
+				"MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X",
+				le16_to_cpu(usb_dev->descriptor.idVendor),
+				le16_to_cpu(usb_dev->descriptor.idProduct),
+				le16_to_cpu(usb_dev->descriptor.bcdDevice),
+				usb_dev->descriptor.bDeviceClass,
+				usb_dev->descriptor.bDeviceSubClass,
+				usb_dev->descriptor.bDeviceProtocol,
+				alt->desc.bInterfaceClass,
+				alt->desc.bInterfaceSubClass,
+				alt->desc.bInterfaceProtocol))
+		return -ENOMEM;
 
 	envp[i] = NULL;