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, 0 insertions, 9 deletions

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 85c3572155d..f7a59f5d70c 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -350,16 +350,7 @@ struct ehci_qh {
         struct ehci_qtd         *dummy;
         struct ehci_qh          *reclaim;       /* next to reclaim */
 
-        struct ehci_hcd         *ehci;
         unsigned long           unlink_time;
-
-        /*
-         * Do NOT use atomic operations for QH refcounting. On some CPUs
-         * (PPC7448 for example), atomic operations cannot be performed on
-         * memory that is cache-inhibited (i.e. being used for DMA).
-         * Spinlocks are used to protect all QH fields.
-         */
-        u32                     refcount;
         unsigned                stamp;
 
         u8                      needs_rescan;   /* Dequeue during giveback */