usb-storage: improve debug logging

Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb/dev-storage.c

@@ -383,6 +383,9 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
             assert(le32_to_cpu(s->csw.residue) == 0);
             s->scsi_len = 0;
             s->req = scsi_req_new(s->scsi_dev, tag, 0, cbw.cmd, NULL);
+#ifdef DEBUG_MSD
+            scsi_req_print(s->req);
+#endif
             scsi_req_enqueue(s->req);
             if (s->req && s->req->cmd.xfer != SCSI_XFER_NONE) {
                 scsi_req_continue(s->req);
@@ -410,7 +413,7 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
                 }
             }
             if (p->result < p->iov.size) {
-                DPRINTF("Deferring packet %p\n", p);
+                DPRINTF("Deferring packet %p [wait data-out]\n", p);
                 s->packet = p;
                 ret = USB_RET_ASYNC;
             } else {
@@ -445,6 +448,7 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 
             if (s->req) {
                 /* still in flight */
+                DPRINTF("Deferring packet %p [wait status]\n", p);
                 s->packet = p;
                 ret = USB_RET_ASYNC;
             } else {
@@ -471,7 +475,7 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
                 }
             }
             if (p->result < p->iov.size) {
-                DPRINTF("Deferring packet %p\n", p);
+                DPRINTF("Deferring packet %p [wait data-in]\n", p);
                 s->packet = p;
                 ret = USB_RET_ASYNC;
             } else {