* Reset the connection state and speed when the underlaying device is removed.

* Notify the stack of this by releasing the link state change sem (if present).
* Also check for a removed device in the notify callback to prevent accessing
  a device that is going down.

Removing the device under Haiku with an active link will now report the loss of
connection. Still left to implement is to reuse a still existing device if the
same device (based on its MAC) is replugged.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25459 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/network/usb_ecm/ECMDevice.cpp

@@ -372,6 +372,18 @@ ECMDevice::Control(uint32 op, void *buffer, size_t length)
 }
 
 
+void
+ECMDevice::Removed()
+{
+	fRemoved = true;
+	fHasConnection = false;
+	fDownstreamSpeed = fUpstreamSpeed = 0;
+
+	if (fLinkStateChangeSem >= B_OK)
+		release_sem_etc(fLinkStateChangeSem, 1, B_DO_NOT_RESCHEDULE);
+}
+
+
 status_t
 ECMDevice::_ReadMACAddress()
 {
@@ -432,10 +444,10 @@ void
 ECMDevice::_NotifyCallback(void *cookie, int32 status, void *data,
 	uint32 actualLength)
 {
-	if (status == B_CANCELED)
+	ECMDevice *device = (ECMDevice *)cookie;
+	if (status == B_CANCELED || device->fRemoved)
 		return;
 
-	ECMDevice *device = (ECMDevice *)cookie;
 	if (status == B_OK && actualLength >= sizeof(cdc_notification)) {
 		bool linkStateChange = false;
 		cdc_notification *notification

src/add-ons/kernel/drivers/network/usb_ecm/ECMDevice.h

@@ -25,7 +25,7 @@ public:
 		status_t			Write(const uint8 *buffer, size_t *numBytes);
 		status_t			Control(uint32 op, void *buffer, size_t length);
 
-		void				Removed() { fRemoved = true; };
+		void				Removed();
 		bool				IsRemoved() { return fRemoved; };
 
 private: