USB: add a private-data pointer to struct usb_tt

For improved scheduling of transfers through a Transaction Translator,
ehci-hcd will need to store a bunch of information associated with the
FS/LS bus on the downstream side of the TT.  This patch adds a pointer
for such HCD-private data to the usb_tt structure.

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

diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index dbe3cd1..b8aba19 100644 (file)
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -506,6 +506,7 @@ struct usb_tt {
        struct usb_device       *hub;   /* upstream highspeed hub */
        int                     multi;  /* true means one TT per port */
        unsigned                think_time;     /* think time in ns */
+       void                    *hcpriv;        /* HCD private data */
 
        /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
        spinlock_t              lock;