staging: vt6656: return from workqueues on fMP_DISCONNECTED

Return from work queues on flag fMP_DISCONNECTED to prevent
any scheduling threads past closing of device.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/bssdb.c

@@ -824,6 +824,9 @@ void BSSvSecondCallBack(struct work_struct *work)
 	u32 uNonShortSlotSTACnt = 0;
 	u32 uLongPreambleSTACnt = 0;
 
+	if (pDevice->Flags & fMP_DISCONNECTED)
+		return;
+
     spin_lock_irq(&pDevice->lock);
 
     pDevice->uAssocCount = 0;

drivers/staging/vt6656/dpc.c

@@ -1339,6 +1339,9 @@ void RXvWorkItem(struct work_struct *work)
 	int ntStatus;
 	struct vnt_rcb *pRCB = NULL;
 
+	if (pDevice->Flags & fMP_DISCONNECTED)
+		return;
+
     DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"---->Rx Polling Thread\n");
     spin_lock_irq(&pDevice->lock);
 
@@ -1398,6 +1401,9 @@ void RXvMngWorkItem(struct work_struct *work)
 	struct vnt_rx_mgmt *pRxPacket;
 	int bReAllocSkb = false;
 
+	if (pDevice->Flags & fMP_DISCONNECTED)
+		return;
+
     DBG_PRT(MSG_LEVEL_DEBUG, KERN_INFO"---->Rx Mng Thread\n");
 
     spin_lock_irq(&pDevice->lock);

drivers/staging/vt6656/wcmd.c

@@ -286,6 +286,9 @@ void vRunCommand(struct work_struct *work)
 	u8 byMask[8] = {1, 2, 4, 8, 0x10, 0x20, 0x40, 0x80};
 	u8 byData;
 
+	if (pDevice->Flags & fMP_DISCONNECTED)
+		return;
+
     if (pDevice->dwDiagRefCount != 0)
         return;
     if (pDevice->bCmdRunning != true)