5ab9f9c621
when there are multiple readers of /dev/usbevent, we have to serialize the processing to make sure that only one driver is opening the devices control endpoint at a time. to do this, we assume the device is busy after reading the event file until the next read or clunk on the same fid. to mark a device busy, we set the dev->aux pointer to the fid processing a event. And the Event structure takes a reference to the device producing the event. the problem arised from cdc ethernet and nusb/serial sharing the same device class, and we need to run the particular driver to figure out if the device can be used. doing this concurrently fails because devusb allows only one open per endpoint. |
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