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[Qemu-devel] [PATCH] ehci: raise irq in the frame timer

From: Gerd Hoffmann
Subject: [Qemu-devel] [PATCH] ehci: raise irq in the frame timer
Date: Tue, 10 Jul 2012 18:07:50 +0200

With the async schedule being kicked from other places than the frame
timer (commit 0f588df8b3688b00e77aabaa32e26ece5f19bd39) it may happen
that we call ehci_commit_interrupt() more than once per frame.

Move the call from the async schedule handler to the frame timer to
restore old irq behavior, which is more correct.  Fixes regressions
with some linux kernel versions.

TODO: implement full Interrupt Threshold Control support.

Signed-off-by: Gerd Hoffmann <address@hidden>
 hw/usb/hcd-ehci.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 080f62c..7c5f398 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -2208,8 +2208,6 @@ static void ehci_advance_state(EHCIState *ehci, int async)
     while (again);
-    ehci_commit_interrupt(ehci);
 static void ehci_advance_async_state(EHCIState *ehci)
@@ -2389,6 +2387,8 @@ static void ehci_frame_timer(void *opaque)
     if (schedules) {
         qemu_mod_timer(ehci->frame_timer, expire_time);
+    ehci_commit_interrupt(ehci);
 static void ehci_async_bh(void *opaque)

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