CHROMIUM: gobi: Fix races in qc_deregister() once and for all.

drivers/net/usb/gobi/structs.h

Index: drivers/net/usb/gobi/structs.h
diff --git a/drivers/net/usb/gobi/structs.h b/drivers/net/usb/gobi/structs.h
index 7a89c5c05394b7702029a04071f9f7da5181f91f..c0e28a070b52960c60766a4d14aff88772f620a9 100644
--- a/drivers/net/usb/gobi/structs.h
+++ b/drivers/net/usb/gobi/structs.h
@@ -25,6 +25,7 @@
 #include <linux/usb.h>
 #include <linux/version.h>
 #include <linux/cdev.h>
+#include <linux/kobject.h>
 #include <linux/kthread.h>
 
 #include <linux/usb/usbnet.h>
@@ -78,12 +79,15 @@ enum {
 };
 
 struct qcusbnet {
+	struct mutex lock;
+	struct kref refcount;
 	struct usbnet *usbnet;
 	struct usb_interface *iface;
 	int (*open)(struct net_device *);
 	int (*stop)(struct net_device *);
 	unsigned long down;
 	bool valid;
+	bool dying;
 	struct qmidev qmi;
 	char meid[14];
 	struct worker worker;