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usb-redir: Device disconnect + re-connect robustness fixes 

These fixes mainly target the other side sending some (error status)
packets after a disconnect packet. In some cases these would get queued
up and then reported to the controller when a new device gets connected.

* Fully reset device state on disconnect
* Don't allow a connect message when already connected
* Ignore iso and interrupt status messages when disconnected

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Hans de Goede 2011-11-19 10:22:46 +01:00 committed by Anthony Liguori
parent 65f9d98673
commit 99f08100cd
1 changed files with 21 additions and 1 deletions
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22
usb-redir.c
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@ -881,6 +881,11 @@ static void usbredir_device_connect(void *priv,
{
USBRedirDevice *dev = priv;
if (qemu_timer_pending(dev->attach_timer) || dev->dev.attached) {
ERROR("Received device connect while already connected\n");
return;
}
switch (device_connect->speed) {
case usb_redir_speed_low:
DPRINTF("attaching low speed device\n");
@ -909,19 +914,26 @@ static void usbredir_device_connect(void *priv,
static void usbredir_device_disconnect(void *priv)
{
USBRedirDevice *dev = priv;
int i;
/* Stop any pending attaches */
qemu_del_timer(dev->attach_timer);
if (dev->dev.attached) {
usb_device_detach(&dev->dev);
usbredir_cleanup_device_queues(dev);
/*
* Delay next usb device attach to give the guest a chance to see
* see the detach / attach in case of quick close / open succession
*/
dev->next_attach_time = qemu_get_clock_ms(vm_clock) + 200;
}
/* Reset state so that the next dev connected starts with a clean slate */
usbredir_cleanup_device_queues(dev);
memset(dev->endpoint, 0, sizeof(dev->endpoint));
for (i = 0; i < MAX_ENDPOINTS; i++) {
QTAILQ_INIT(&dev->endpoint[i].bufpq);
}
}
static void usbredir_interface_info(void *priv,
@ -1013,6 +1025,10 @@ static void usbredir_iso_stream_status(void *priv, uint32_t id,
DPRINTF("iso status %d ep %02X id %u\n", iso_stream_status->status,
ep, id);
if (!dev->dev.attached) {
return;
}
dev->endpoint[EP2I(ep)].iso_error = iso_stream_status->status;
if (iso_stream_status->status == usb_redir_stall) {
DPRINTF("iso stream stopped by peer ep %02X\n", ep);
@ -1030,6 +1046,10 @@ static void usbredir_interrupt_receiving_status(void *priv, uint32_t id,
DPRINTF("interrupt recv status %d ep %02X id %u\n",
interrupt_receiving_status->status, ep, id);
if (!dev->dev.attached) {
return;
}
dev->endpoint[EP2I(ep)].interrupt_error =
interrupt_receiving_status->status;
if (interrupt_receiving_status->status == usb_redir_stall) {