From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 24 Jun 2008 18:47:29 +0000 (-0400)
Subject: usbfs: don't store bad pointers in registration
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e04199b2167e88f0e2d0410fafaa2c35ff7ba8c1;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

usbfs: don't store bad pointers in registration

This patch (as1107) fixes a small bug in the usbfs registration and
unregistration code.  It avoids leaving an error value stored in the
device's usb_classdev field and it avoids trying to unregister a NULL
pointer.  (It also fixes a rather extreme overuse of whitespace.)

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index c44e98f6099e..5580c6e59bae 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1726,20 +1726,21 @@ static struct class *usb_classdev_class;
 
 static int usb_classdev_add(struct usb_device *dev)
 {
-	int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
-
-	dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
-				MKDEV(USB_DEVICE_MAJOR, minor),
-				"usbdev%d.%d", dev->bus->busnum, dev->devnum);
-	if (IS_ERR(dev->usb_classdev))
-		return PTR_ERR(dev->usb_classdev);
-
+	struct device *cldev;
+
+	cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
+			      "usbdev%d.%d", dev->bus->busnum,
+			      dev->devnum);
+	if (IS_ERR(cldev))
+		return PTR_ERR(cldev);
+	dev->usb_classdev = cldev;
 	return 0;
 }
 
 static void usb_classdev_remove(struct usb_device *dev)
 {
-	device_unregister(dev->usb_classdev);
+	if (dev->usb_classdev)
+		device_unregister(dev->usb_classdev);
 	usb_fs_classdev_common_remove(dev);
 }