diff mbox

[04/36] ehci: Set int flag on a short input packet

Message ID 1351169529-10799-5-git-send-email-kraxel@redhat.com
State New
Headers show

Commit Message

Gerd Hoffmann Oct. 25, 2012, 12:51 p.m. UTC 
From: Hans de Goede <hdegoede@redhat.com>

According to 4.15.1.2 an interrupt must be raised when a short packet
is received. If we don't do this it may take a significant time for
the guest to notice a short trasnfer has completed, since only the last td
will have its IOC flag set, and a short transfer may complete in an earlier
packet.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb/hcd-ehci.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 82f4dbd..8b4e3c8 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1508,6 +1508,10 @@  static void ehci_execute_complete(EHCIQueue *q)
 
         if (tbytes && p->pid == USB_TOKEN_IN) {
             tbytes -= p->usb_status;
+            if (tbytes) {
+                /* 4.15.1.2 must raise int on a short input packet */
+                ehci_raise_irq(q->ehci, USBSTS_INT);
+            }
         } else {
             tbytes = 0;
         }