USB: uhci: don't use pseudo negative values

The code in uhci-q.c doesn't have to use pseudo-negative values.  I did
it that way because it was easy and because it would give the expected
output during debugging.  But it doesn't have to work that way.  Here's
another approach.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 7 insertions, 8 deletions

diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index 20cc58b97807..e52b954dda47 100644
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -118,7 +118,9 @@ static int uhci_show_urbp(struct urb_priv *urbp, char *buf, int len, int space)
         }
 
         out += sprintf(out, "%s%s", ptype, (urbp->fsbr ? " FSBR" : ""));
-        out += sprintf(out, " Actlen=%d", urbp->urb->actual_length);
+        out += sprintf(out, " Actlen=%d%s", urbp->urb->actual_length,
+                        (urbp->qh->type == USB_ENDPOINT_XFER_CONTROL ?
+                                "-8" : ""));
 
         if (urbp->urb->unlinked)
                 out += sprintf(out, " Unlinked=%d", urbp->urb->unlinked);
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 58f873679145..3e5807d14ffb 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -899,8 +899,6 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
         }
         if (qh->state != QH_STATE_ACTIVE)
                 qh->skel = skel;
-
-        urb->actual_length = -8;        /* Account for the SETUP packet */
         return 0;
 
 nomem:
@@ -1494,11 +1492,10 @@ __acquires(uhci->lock)
 
         if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
 
-                /* urb->actual_length < 0 means the setup transaction didn't
-                 * complete successfully.  Either it failed or the URB was
-                 * unlinked first.  Regardless, don't confuse people with a
-                 * negative length. */
-                urb->actual_length = max(urb->actual_length, 0);
+                /* Subtract off the length of the SETUP packet from
+                 * urb->actual_length.
+                 */
+                urb->actual_length -= min_t(u32, 8, urb->actual_length);
         }
 
         /* When giving back the first URB in an Isochronous queue,