USB: EHCI: defer reclamation of siTDs

This patch (as1369) fixes a problem in ehci-hcd.  Some controllers
occasionally run into trouble when the driver reclaims siTDs too
quickly.  This can happen while streaming audio; it causes the
controller to crash.

The patch changes siTD reclamation to work the same way as iTD
reclamation: Completed siTDs are stored on a list and not reused until
at least one frame has passed.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Nate Case <ncase@xes-inc.com>
CC: <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index b1dce96dd621..556c0b48f3ab 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -87,8 +87,9 @@ struct ehci_hcd {			/* one per controller */
         int                     next_uframe;    /* scan periodic, start here */
         unsigned                periodic_sched; /* periodic activity count */
 
-        /* list of itds completed while clock_frame was still active */
+        /* list of itds & sitds completed while clock_frame was still active */
         struct list_head        cached_itd_list;
+        struct list_head        cached_sitd_list;
         unsigned                clock_frame;
 
         /* per root hub port */
@@ -195,7 +196,7 @@ timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
         clear_bit (action, &ehci->actions);
 }
 
-static void free_cached_itd_list(struct ehci_hcd *ehci);
+static void free_cached_lists(struct ehci_hcd *ehci);
 
 /*-------------------------------------------------------------------------*/