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usb: keep track of packet owner.

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Keep track of the device which owns the usb packet for async processing.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-05-12 13:48:13 +02:00
parent 53aa8c0e2a
commit 4ff658fb6c
2 changed files with 35 additions and 15 deletions
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32
hw/usb.c
View file

@ -313,6 +313,38 @@ int usb_handle_packet(USBDevice *dev, USBPacket *p)
{
int ret;
assert(p->owner == NULL);
ret = dev->info->handle_packet(dev, p);
if (ret == USB_RET_ASYNC) {
if (p->owner == NULL) {
p->owner = dev;
} else {
/* We'll end up here when usb_handle_packet is called
* recursively due to a hub being in the chain. Nothing
* to do. Leave p->owner pointing to the device, not the
* hub. */;
}
}
return ret;
}
/* Notify the controller that an async packet is complete. This should only
be called for packets previously deferred by returning USB_RET_ASYNC from
handle_packet. */
void usb_packet_complete(USBDevice *dev, USBPacket *p)
{
/* Note: p->owner != dev is possible in case dev is a hub */
assert(p->owner != NULL);
dev->port->ops->complete(dev, p);
p->owner = NULL;
}
/* Cancel an active packet. The packed must have been deferred by
returning USB_RET_ASYNC from handle_packet, and not yet
completed. */
void usb_cancel_packet(USBPacket * p)
{
assert(p->owner != NULL);
p->cancel_cb(p, p->cancel_opaque);
p->owner = NULL;
}