USB: EHCI: don't refcount iso_stream structures

This patch (as1580) makes ehci_iso_stream structures behave more like
QHs, in that they will remain allocated until their isochronous
endpoint is disabled.  This will come in useful in the future, when
periodic bandwidth gets allocated as an altsetting is installed rather
than on-the-fly.

For now, the change to the ehci_iso_stream lifetimes means that each
structure is always deallocated at exactly one spot in
ehci_endpoint_disable() and never used again.  As a result, it is no
longer necessary to use reference counting on these things, and the
patch removes it.

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

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index bcfbb175e2b4..755e30b0000b 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -386,7 +386,7 @@ struct ehci_qh_hw {
 } __attribute__ ((aligned(32)));
 
 struct ehci_qh {
-        struct ehci_qh_hw       *hw;
+        struct ehci_qh_hw       *hw;            /* Must come first */
         /* the rest is HCD-private */
         dma_addr_t              qh_dma;         /* address of qh */
         union ehci_shadow       qh_next;        /* ptr to qh; or periodic */
@@ -453,7 +453,6 @@ struct ehci_iso_stream {
         /* first field matches ehci_hq, but is NULL */
         struct ehci_qh_hw       *hw;
 
-        u32                     refcount;
         u8                      bEndpointAddress;
         u8                      highspeed;
         struct list_head        td_list;        /* queued itds/sitds */