Don't consider PCIe hot-plug command timeout fatal. According to my tests and errata to several generations of Intel CPUs, PCIe hot-plug command completion reporting is not very reliable thing. At least on my Supermicro X11DPi-NT board I never saw it reported. Before this change timeout code detached devices and tried to disable the slot, that in my case resulted in hot-plugged device being detached just a second after it was successfully detected and attached. This change removes that, so in case of timeout it just prints the error and continue operation. Linux does the same.
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