[PATCH] USB storage: avoid sending URBs when disconnecting

This patch avoids sending URBs which are part of the reset system when the
device is being disconnected.  It also makes the control thread avoid
starting anything for a device in that state.

drivers/usb/storage/scsiglue.c

@@ -166,6 +166,10 @@ static int device_reset( Scsi_Cmnd *srb )
 
 	/* lock the device pointers and do the reset */
 	down(&(us->dev_semaphore));
+	if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
+		result = FAILED;
+		US_DEBUGP("No reset during disconnect\n");
+	} else
 		result = us->transport_reset(us);
 	up(&(us->dev_semaphore));
 
@@ -202,7 +206,7 @@ static int bus_reset( Scsi_Cmnd *srb )
 	down(&(us->dev_semaphore));
 	if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
 		result = -EIO;
-		US_DEBUGP("Attempt to reset during disconnect\n");
+		US_DEBUGP("No reset during disconnect\n");
 	} else if (us->pusb_dev->actconfig->desc.bNumInterfaces != 1) {
 		result = -EBUSY;
 		US_DEBUGP("Refusing to reset a multi-interface device\n");

drivers/usb/storage/transport.c

@@ -1065,6 +1065,10 @@ static int usb_stor_reset_common(struct us_data *us,
 	schedule_timeout(HZ*6);
 	set_current_state(TASK_RUNNING);
 	down(&us->dev_semaphore);
+	if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
+		US_DEBUGP("Reset interrupted by disconnect\n");
+		return FAILED;
+	}
 
 	US_DEBUGP("Soft reset: clearing bulk-in endpoint halt\n");
 	result = usb_stor_clear_halt(us, us->recv_bulk_pipe);

drivers/usb/storage/usb.c

@@ -338,10 +338,16 @@ static int usb_stor_control_thread(void * __us)
 		/* lock the device pointers */
 		down(&(us->dev_semaphore));
 
+		/* don't do anything if we are disconnecting */
+		if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
+			US_DEBUGP("No command during disconnect\n");
+			us->srb->result = DID_BAD_TARGET << 16;
+		}
+
 		/* reject the command if the direction indicator 
 		 * is UNKNOWN
 		 */
-		if (us->srb->sc_data_direction == SCSI_DATA_UNKNOWN) {
+		else if (us->srb->sc_data_direction == SCSI_DATA_UNKNOWN) {
 			US_DEBUGP("UNKNOWN data direction\n");
 			us->srb->result = DID_ERROR << 16;
 		}