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From 6e6bfa88ae3867afd8258b43e3c05cba2585ee37 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Thu, 1 Mar 2012 21:43:56 +0100
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Subject: [PATCH 133/140] usb-ehci: Fix cerr tracking
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cerr should only be decremented on errors which cause XactErr to be set, and
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when that happens the failing transaction should be retried until cerr reaches
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0 and only then should USBSTS_ERRINT be set (and inactive cleared and
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USBSTS_INT set if requested).
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Since we don't have any hardware level errors (and in case of redirection
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the real hardware has already retried), re-trying makes no sense, so
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immediately set cerr to 0 on errors which set XactErr.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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hw/usb-ehci.c | 19 ++++++-------------
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1 file changed, 6 insertions(+), 13 deletions(-)
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diff --git a/hw/usb-ehci.c b/hw/usb-ehci.c
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index bc5f591..a3d5c11 100644
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--- a/hw/usb-ehci.c
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+++ b/hw/usb-ehci.c
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@@ -1269,7 +1269,7 @@ static void ehci_async_complete_packet(USBPort *port, USBPacket *packet)
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static void ehci_execute_complete(EHCIQueue *q)
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{
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- int c_err, reload;
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+ int reload;
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assert(q->async != EHCI_ASYNC_INFLIGHT);
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q->async = EHCI_ASYNC_NONE;
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@@ -1278,15 +1278,10 @@ static void ehci_execute_complete(EHCIQueue *q)
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q->qhaddr, q->qh.next, q->qtdaddr, q->usb_status);
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if (q->usb_status < 0) {
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-err:
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- /* TO-DO: put this is in a function that can be invoked below as well */
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- c_err = get_field(q->qh.token, QTD_TOKEN_CERR);
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- c_err--;
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- set_field(&q->qh.token, c_err, QTD_TOKEN_CERR);
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-
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switch(q->usb_status) {
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case USB_RET_NODEV:
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q->qh.token |= (QTD_TOKEN_HALT | QTD_TOKEN_XACTERR);
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+ set_field(&q->qh.token, 0, QTD_TOKEN_CERR);
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ehci_record_interrupt(q->ehci, USBSTS_ERRINT);
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break;
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case USB_RET_STALL:
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@@ -1314,15 +1309,13 @@ err:
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assert(0);
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break;
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}
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+ } else if ((q->usb_status > q->tbytes) && (q->pid == USB_TOKEN_IN)) {
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+ q->usb_status = USB_RET_BABBLE;
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+ q->qh.token |= (QTD_TOKEN_HALT | QTD_TOKEN_BABBLE);
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+ ehci_record_interrupt(q->ehci, USBSTS_ERRINT);
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} else {
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- // DPRINTF("Short packet condition\n");
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// TODO check 4.12 for splits
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- if ((q->usb_status > q->tbytes) && (q->pid == USB_TOKEN_IN)) {
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- q->usb_status = USB_RET_BABBLE;
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- goto err;
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- }
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-
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if (q->tbytes && q->pid == USB_TOKEN_IN) {
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q->tbytes -= q->usb_status;
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} else {
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--
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1.7.9.3
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