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authorHans de Goede <hdegoede@redhat.com>2012-08-17 11:39:16 +0200
committerGerd Hoffmann <kraxel@redhat.com>2012-09-11 07:42:58 +0200
commit45b339b18c660eb85af2ba25bfcaed5469660d77 (patch)
treeec30543725e2de4891e524e931e0c35a92f4642a /hw/usb
parent4b1c11fd20e8901f04a2d9c225cd10fc05a762ff (diff)
usb: controllers do not need to check for babble themselves
If an (emulated) usb-device tries to write more data to a packet then its iov len, this will trigger an assert in usb_packet_copy(), and if a driver somehow circumvents that check and writes more data to the iov then there is space, we have a much bigger problem then not correctly reporting babble to the guest. In practice babble will only happen with (real) redirected devices, and there both the usb-host os and the qemu usb-device code already check for it. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'hw/usb')
-rw-r--r--hw/usb/hcd-ehci.c4
-rw-r--r--hw/usb/hcd-uhci.c5
2 files changed, 0 insertions, 9 deletions
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 017342b56a..95232472a3 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1481,10 +1481,6 @@ static void ehci_execute_complete(EHCIQueue *q)
assert(0);
break;
}
- } else if ((p->usb_status > p->tbytes) && (p->pid == USB_TOKEN_IN)) {
- p->usb_status = USB_RET_BABBLE;
- q->qh.token |= (QTD_TOKEN_HALT | QTD_TOKEN_BABBLE);
- ehci_raise_irq(q->ehci, USBSTS_ERRINT);
} else {
// TODO check 4.12 for splits
diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index b0db92145a..c7c878635a 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -729,11 +729,6 @@ static int uhci_complete_td(UHCIState *s, UHCI_TD *td, UHCIAsync *async, uint32_
*int_mask |= 0x01;
if (pid == USB_TOKEN_IN) {
- if (len > max_len) {
- ret = USB_RET_BABBLE;
- goto out;
- }
-
if ((td->ctrl & TD_CTRL_SPD) && len < max_len) {
*int_mask |= 0x02;
/* short packet: do not update QH */