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usb: add serial number generator

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This patch adds a function which creates unique serial numbers for usb
devices and puts it into use.  Windows guests tend to become unhappy if
they find two identical usb devices in the system.  Effects range from
non-functional devices (with yellow exclamation mark in device manager)
to BSODs.  Handing out unique serial numbers to devices fixes this.

With this patch applied almost all emulated devices get a generated,
unique serial number.  There are two exceptions:

 * usb-storage devices will prefer a user-specified serial number
   and will only get a generated number in case the serial property
   is unset.
 * usb-hid devices keep the fixed serial number "42" as it is used
   to signal "remote wakeup actually works".
   See commit 7b074a22da

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-04-20 12:33:30 +02:00
parent b15cf49b78
commit 9d55d1adc8
10 changed files with 42 additions and 0 deletions
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1
hw/usb/dev-hub.c
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@ -520,6 +520,7 @@ static int usb_hub_initfn(USBDevice *dev)
USBHubPort *port;
int i;
usb_desc_create_serial(dev);
usb_desc_init(dev);
s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
for (i = 0; i < NUM_PORTS; i++) {