uas: Urbs must be anchored before submitting them

Otherwise they may complete before they get anchored and thus never get
unanchored (as the unanchoring is done by the usb core on completion).

This commit also remove the usb_get_urb / usb_put_urb around cmd submission +
anchoring, since if done in the proper order this is not necessary.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/storage/uas.c

@@ -531,10 +531,12 @@ static int uas_submit_task_urb(struct scsi_cmnd *cmnd, gfp_t gfp,
 			  usb_free_urb, NULL);
 	urb->transfer_flags |= URB_FREE_BUFFER;
 
+	usb_anchor_urb(urb, &devinfo->cmd_urbs);
 	err = usb_submit_urb(urb, gfp);
-	if (err)
+	if (err) {
+		usb_unanchor_urb(urb);
 		goto err;
-	usb_anchor_urb(urb, &devinfo->cmd_urbs);
+	}
 
 	return 0;
 
@@ -558,13 +560,14 @@ static int uas_submit_sense_urb(struct Scsi_Host *shost,
 	urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
 	if (!urb)
 		return SCSI_MLQUEUE_DEVICE_BUSY;
+	usb_anchor_urb(urb, &devinfo->sense_urbs);
 	if (usb_submit_urb(urb, gfp)) {
+		usb_unanchor_urb(urb);
 		shost_printk(KERN_INFO, shost,
 			     "sense urb submission failure\n");
 		usb_free_urb(urb);
 		return SCSI_MLQUEUE_DEVICE_BUSY;
 	}
-	usb_anchor_urb(urb, &devinfo->sense_urbs);
 	return 0;
 }
 
@@ -594,14 +597,15 @@ static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 	}
 
 	if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
+		usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 		if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
+			usb_unanchor_urb(cmdinfo->data_in_urb);
 			scmd_printk(KERN_INFO, cmnd,
 					"data in urb submission failure\n");
 			return SCSI_MLQUEUE_DEVICE_BUSY;
 		}
 		cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 		cmdinfo->state |= DATA_IN_URB_INFLIGHT;
-		usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 	}
 
 	if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
@@ -614,14 +618,15 @@ static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 	}
 
 	if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
+		usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 		if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
+			usb_unanchor_urb(cmdinfo->data_out_urb);
 			scmd_printk(KERN_INFO, cmnd,
 					"data out urb submission failure\n");
 			return SCSI_MLQUEUE_DEVICE_BUSY;
 		}
 		cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 		cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
-		usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 	}
 
 	if (cmdinfo->state & ALLOC_CMD_URB) {
@@ -633,14 +638,13 @@ static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 	}
 
 	if (cmdinfo->state & SUBMIT_CMD_URB) {
-		usb_get_urb(cmdinfo->cmd_urb);
+		usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 		if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
+			usb_unanchor_urb(cmdinfo->cmd_urb);
 			scmd_printk(KERN_INFO, cmnd,
 					"cmd urb submission failure\n");
 			return SCSI_MLQUEUE_DEVICE_BUSY;
 		}
-		usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
-		usb_put_urb(cmdinfo->cmd_urb);
 		cmdinfo->cmd_urb = NULL;
 		cmdinfo->state &= ~SUBMIT_CMD_URB;
 		cmdinfo->state |= COMMAND_INFLIGHT;