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usb-hub: limit chain length

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USB supports up to 5 hubs chained.
Catch attempts to chain more.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-03-20 11:40:02 +01:00
parent 4b7b2afae7
commit c24e4aac3b
3 changed files with 9 additions and 0 deletions
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2
hw/usb/bus.c
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@ -341,8 +341,10 @@ void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
if (upstream) {
snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
upstream->path, portnr);
downstream->hubcount = upstream->hubcount + 1;
} else {
snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
downstream->hubcount = 0;
}
}