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ehci: fix td writeback 

Only write back the dwords the hc is supposed to update.  Should not
make a difference in theory as the guest must not touch the td while
it is active to avoid races.  But it is still more correct.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-06-19 13:53:28 +02:00
parent a5e0139ab6
commit 4ed1c57a64
1 changed files with 4 additions and 2 deletions
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6
hw/usb/hcd-ehci.c
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@ -2070,6 +2070,7 @@ out:
static int ehci_state_writeback(EHCIQueue *q)
{
EHCIPacket *p = QTAILQ_FIRST(&q->packets);
uint32_t *qtd, addr;
int again = 0;
/* Write back the QTD from the QH area */
@ -2077,8 +2078,9 @@ static int ehci_state_writeback(EHCIQueue *q)
assert(p->qtdaddr == q->qtdaddr);
ehci_trace_qtd(q, NLPTR_GET(p->qtdaddr), (EHCIqtd *) &q->qh.next_qtd);
put_dwords(q->ehci, NLPTR_GET(p->qtdaddr), (uint32_t *) &q->qh.next_qtd,
sizeof(EHCIqtd) >> 2);
qtd = (uint32_t *) &q->qh.next_qtd;
addr = NLPTR_GET(p->qtdaddr);
put_dwords(q->ehci, addr + 2 * sizeof(uint32_t), qtd + 2, 2);
ehci_free_packet(p);
/*