USB: EHCI: don't refcount QHs

This patch (as1567) removes ehci-hcd's reference counting of QH
structures.  It's not necessary to refcount these things because they
always get deallocated at exactly one spot in ehci_endpoint_disable()
(except for two special QHs, ehci->async and ehci->dummy) and are
never used again.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 9 deletions

diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 4378bf72bbac..7d117bbffac1 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -265,7 +265,6 @@ __acquires(ehci->lock)
 			/* ... update hc-wide periodic stats (for usbfs) */
 			ehci_to_hcd(ehci)->self.bandwidth_int_reqs--;
 		}
-		qh_put (qh);
 	}
 
 	if (unlikely(urb->unlinked)) {
@@ -946,7 +945,7 @@ qh_make (
 		ehci_dbg(ehci, "bogus dev %p speed %d\n", urb->dev,
 			urb->dev->speed);
 done:
-		qh_put (qh);
+		qh_destroy(ehci, qh);
 		return NULL;
 	}
 
@@ -1003,7 +1002,6 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 	head->qh_next.qh = qh;
 	head->hw->hw_next = dma;
 
-	qh_get(qh);
 	qh->xacterrs = 0;
 	qh->qh_state = QH_STATE_LINKED;
 	/* qtd completions reported later by interrupt */
@@ -1090,7 +1088,7 @@ static struct ehci_qh *qh_append_tds (
 			wmb ();
 			dummy->hw_token = token;
 
-			urb->hcpriv = qh_get (qh);
+			urb->hcpriv = qh;
 		}
 	}
 	return qh;
@@ -1167,7 +1165,6 @@ static void end_unlink_async (struct ehci_hcd *ehci)
 	// qh->hw_next = cpu_to_hc32(qh->qh_dma);
 	qh->qh_state = QH_STATE_IDLE;
 	qh->qh_next.qh = NULL;
-	qh_put (qh);			// refcount from reclaim
 
 	/* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */
 	next = qh->reclaim;
@@ -1186,7 +1183,6 @@ static void end_unlink_async (struct ehci_hcd *ehci)
 				&& ehci->async->qh_next.qh == NULL)
 			timer_action (ehci, TIMER_ASYNC_OFF);
 	}
-	qh_put(qh);			/* refcount from async list */
 
 	if (next) {
 		ehci->reclaim = NULL;
@@ -1230,7 +1226,7 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 	}
 
 	qh->qh_state = QH_STATE_UNLINK;
-	ehci->reclaim = qh = qh_get (qh);
+	ehci->reclaim = qh;
 
 	prev = ehci->async;
 	while (prev->qh_next.qh != qh)
@@ -1283,12 +1279,10 @@ static void scan_async (struct ehci_hcd *ehci)
 			 * gets unlinked then ehci->qh_scan_next is adjusted
 			 * in start_unlink_async().
 			 */
-			qh = qh_get(qh);
 			temp = qh_completions(ehci, qh);
 			if (qh->needs_rescan)
 				unlink_async(ehci, qh);
 			qh->unlink_time = jiffies + EHCI_SHRINK_JIFFIES;
-			qh_put(qh);
 			if (temp != 0)
 				goto rescan;
 		}