ehci_free_packet: Discard finished packets when the queue is haltedqemu-kvm-1.2-f18

With pipelining it is possible to encounter a finished packet when cleaning
the queue due to a halt. This happens when a non stall error happens while
talking to a real device. In this case the queue on the usb-host side will
continue processing packets, and we can have completed packets waiting in
the queue after an error condition packet causing a halt.

There are 2 reasons to discard the completed packets at this point, rather
then writing them back to the guest:

1) The guest expect to be able to cancel and/or change packets after the
packet with the error without doing an unlink, so writing them back may
confuse the guest.

2) Since the queue does not advance when halted, the writing back of these
packets will trigger an assert because p->qtdaddr != q->qtdaddr, causing qemu
to abort.

Note that discarding these packets means that the guest driver and the device
will get out of sync! This is unfortunate, but should not be a problem since
with a non stall error (iow an io-error) the 2 are out of sync already anyways.
Still this patch adds a warning printf to signal this happening.

Note that sofar this has only been seen with a DVB-T receiver, which gives
of a MPEG-2 stream, which allows for recovering from lost packets, see:
https://bugzilla.redhat.com/show_bug.cgi?id=890320

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 11 insertions, 7 deletions

diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 6be11c5d9..6a787aa04 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -752,11 +752,10 @@ static EHCIPacket *ehci_alloc_packet(EHCIQueue *q)
 
 static void ehci_free_packet(EHCIPacket *p)
 {
-    if (p->async == EHCI_ASYNC_FINISHED) {
+    if (p->async == EHCI_ASYNC_FINISHED &&
+            !(p->queue->qh.token & QTD_TOKEN_HALT)) {
         EHCIQueue *q = p->queue;
         int state = ehci_get_state(q->ehci, q->async);
-        /* This is a normal, but rare condition (cancel racing completion) */
-        fprintf(stderr, "EHCI: Warning packet completed but not processed\n");
         ehci_state_executing(q);
         ehci_state_writeback(q);
         if (!(q->qh.token & QTD_TOKEN_HALT)) {
@@ -767,12 +766,17 @@ static void ehci_free_packet(EHCIPacket *p)
         return;
     }
     trace_usb_ehci_packet_action(p->queue, p, "free");
-    if (p->async == EHCI_ASYNC_INITIALIZED) {
-        usb_packet_unmap(&p->packet, &p->sgl);
-        qemu_sglist_destroy(&p->sgl);
-    }
     if (p->async == EHCI_ASYNC_INFLIGHT) {
         usb_cancel_packet(&p->packet);
+    }
+    if (p->async == EHCI_ASYNC_FINISHED) {
+        fprintf(stderr,
+                "EHCI: Dropping completed packet from halted %s ep %02X\n",
+                (p->pid == USB_TOKEN_IN) ? "in" : "out",
+                get_field(p->queue->qh.epchar, QH_EPCHAR_EP));
+                
+    }
+    if (p->async != EHCI_ASYNC_NONE) {
         usb_packet_unmap(&p->packet, &p->sgl);
         qemu_sglist_destroy(&p->sgl);
     }