1 files changed, 48 insertions, 8 deletions

diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index a081ee65bde6..07bcb931021b 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -1004,7 +1004,8 @@ iso_stream_put(struct ehci_hcd *ehci, struct ehci_iso_stream *stream)
 
                 is_in = (stream->bEndpointAddress & USB_DIR_IN) ? 0x10 : 0;
                 stream->bEndpointAddress &= 0x0f;
-                stream->ep->hcpriv = NULL;
+                if (stream->ep)
+                        stream->ep->hcpriv = NULL;
 
                 if (stream->rescheduled) {
                         ehci_info (ehci, "ep%d%s-iso rescheduled "
@@ -1653,14 +1654,28 @@ itd_complete (
                         (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
         }
         iso_stream_put (ehci, stream);
-        /* OK to recycle this ITD now that its completion callback ran. */
+
 done:
         usb_put_urb(urb);
         itd->urb = NULL;
-        itd->stream = NULL;
-        list_move(&itd->itd_list, &stream->free_list);
-        iso_stream_put(ehci, stream);
-
+        if (ehci->clock_frame != itd->frame || itd->index[7] != -1) {
+                /* OK to recycle this ITD now. */
+                itd->stream = NULL;
+                list_move(&itd->itd_list, &stream->free_list);
+                iso_stream_put(ehci, stream);
+        } else {
+                /* HW might remember this ITD, so we can't recycle it yet.
+                 * Move it to a safe place until a new frame starts.
+                 */
+                list_move(&itd->itd_list, &ehci->cached_itd_list);
+                if (stream->refcount == 2) {
+                        /* If iso_stream_put() were called here, stream
+                         * would be freed.  Instead, just prevent reuse.
+                         */
+                        stream->ep->hcpriv = NULL;
+                        stream->ep = NULL;
+                }
+        }
         return retval;
 }
 
@@ -2101,6 +2116,20 @@ done:
 
 /*-------------------------------------------------------------------------*/
 
+static void free_cached_itd_list(struct ehci_hcd *ehci)
+{
+        struct ehci_itd *itd, *n;
+
+        list_for_each_entry_safe(itd, n, &ehci->cached_itd_list, itd_list) {
+                struct ehci_iso_stream  *stream = itd->stream;
+                itd->stream = NULL;
+                list_move(&itd->itd_list, &stream->free_list);
+                iso_stream_put(ehci, stream);
+        }
+}
+
+/*-------------------------------------------------------------------------*/
+
 static void
 scan_periodic (struct ehci_hcd *ehci)
 {
@@ -2115,10 +2144,17 @@ scan_periodic (struct ehci_hcd *ehci)
          * Touches as few pages as possible:  cache-friendly.
          */
         now_uframe = ehci->next_uframe;
-        if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
+        if (HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
                 clock = ehci_readl(ehci, &ehci->regs->frame_index);
-        else
+                clock_frame = (clock >> 3) % ehci->periodic_size;
+        } else  {
                 clock = now_uframe + mod - 1;
+                clock_frame = -1;
+        }
+        if (ehci->clock_frame != clock_frame) {
+                free_cached_itd_list(ehci);
+                ehci->clock_frame = clock_frame;
+        }
         clock %= mod;
         clock_frame = clock >> 3;
 
@@ -2277,6 +2313,10 @@ restart:
                         /* rescan the rest of this frame, then ... */
                         clock = now;
                         clock_frame = clock >> 3;
+                        if (ehci->clock_frame != clock_frame) {
+                                free_cached_itd_list(ehci);
+                                ehci->clock_frame = clock_frame;
+                        }
                 } else {
                         now_uframe++;
                         now_uframe %= mod;