[Qemu-devel] [PATCH 13/31] usb-ehci: drop EXECUTING checks.

[Gerd Hoffmann <kraxel@redhat.com>]

The state machine doesn't stop in EXECUTING state any more when async
packets are in flight, so the checks are not needed any more and can
be dropped.

Also kick out the check for the frame timer.  As we don't stop & sleep
any more on async packets this is obsolete.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb-ehci.c |   32 ++------------------------------
 1 files changed, 2 insertions(+), 30 deletions(-)

diff --git a/hw/usb-ehci.c b/hw/usb-ehci.c
index e345a1c..8b1ae3a 100644
--- a/hw/usb-ehci.c
+++ b/hw/usb-ehci.c
@@ -1437,17 +1437,6 @@ static int ehci_state_fetchentry(EHCIState *ehci, int async)
     int again = 0;
     uint32_t entry = ehci_get_fetch_addr(ehci, async);
 
-#if EHCI_DEBUG == 0
-    if (qemu_get_clock_ns(vm_clock) / 1000 >= ehci->frame_end_usec) {
-        if (async) {
-            DPRINTF("FETCHENTRY: FRAME timer elapsed, exit state machine\n");
-            goto out;
-        } else {
-            DPRINTF("FETCHENTRY: WARNING "
-                    "- frame timer elapsed during periodic\n");
-        }
-    }
-#endif
     if (entry < 0x1000) {
         DPRINTF("fetchentry: entry invalid (0x%08x)\n", entry);
         ehci_set_state(ehci, async, EST_ACTIVE);
@@ -1952,12 +1941,6 @@ static void ehci_advance_async_state(EHCIState *ehci)
         }
 
         ehci_set_state(ehci, async, EST_WAITLISTHEAD);
-        /* fall through */
-
-    case EST_FETCHENTRY:
-        /* fall through */
-
-    case EST_EXECUTING:
         ehci_advance_state(ehci, async);
         break;
 
@@ -2010,11 +1993,6 @@ static void ehci_advance_periodic_state(EHCIState *ehci)
         ehci_advance_state(ehci, async);
         break;
 
-    case EST_EXECUTING:
-        DPRINTF("PERIODIC state adv for executing\n");
-        ehci_advance_state(ehci, async);
-        break;
-
     default:
         /* this should only be due to a developer mistake */
         fprintf(stderr, "ehci: Bad periodic state %d. "
@@ -2063,11 +2041,7 @@ static void ehci_frame_timer(void *opaque)
         if (frames - i > 10) {
             skipped_frames++;
         } else {
-            // TODO could this cause periodic frames to get skipped if async
-            // active?
-            if (ehci_get_state(ehci, 1) != EST_EXECUTING) {
-                ehci_advance_periodic_state(ehci);
-            }
+            ehci_advance_periodic_state(ehci);
         }
 
         ehci->last_run_usec += FRAME_TIMER_USEC;
@@ -2082,9 +2056,7 @@ static void ehci_frame_timer(void *opaque)
     /*  Async is not inside loop since it executes everything it can once
      *  called
      */
-    if (ehci_get_state(ehci, 0) != EST_EXECUTING) {
-        ehci_advance_async_state(ehci);
-    }
+    ehci_advance_async_state(ehci);
 
     qemu_mod_timer(ehci->frame_timer, expire_time);
 }
-- 
1.7.1