[Qemu-devel] [PATCH 18/35] ehci: update irq on reset

[Michael Roth <mdroth@linux.vnet.ibm.com>]

From: Gerd Hoffmann <kraxel@redhat.com>

After clearing the status register we also have to update the irq line
status.  Otherwise a irq which happends to be pending at reset time
causes a interrupt storm.  And the guest can't stop as the status
register doesn't indicate any pending interrupt.

Both NetBSD and FreeBSD hang on shutdown because of that.

Cc: qemu-stable@nongnu.org
Reported-by: Andrey Korolyov <andrey@xdel.ru>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1453203884-4125-1-git-send-email-kraxel@redhat.com
(cherry picked from commit 5a8660741a8aa19fbf8a5e8a2b3aac88664f4e66)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/usb/hcd-ehci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index d07f228..d2b7fa2 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -865,6 +865,7 @@ void ehci_reset(void *opaque)
     s->usbsts = USBSTS_HALT;
     s->usbsts_pending = 0;
     s->usbsts_frindex = 0;
+    ehci_update_irq(s);
 
     s->astate = EST_INACTIVE;
     s->pstate = EST_INACTIVE;
-- 
1.9.1