Hi
I met a dead lock in usbredir. When a device with interrupt endpoint was
plugged in, the func usbredirhost_start_interrupt_receiving may be called,
which locked the host first. Then submitted the transfer and call
usbi_fd_notification, which called libusb_lock_events(ctx). Another thread
"spice_usb_device_manager_usb_ev_thread" handled events from libusb. which lock
the events(libusb_lock_events) first. Then func
usbredirhost_buffered_packet_complete may be called which locked the host. This
may cause deadlock!I had meet this several times. I think usbredirhost should
lock the event lock before lock host.
Thx!Yongjian Xu.
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