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Under certain conditions on the Solaris OS, a device driver cannot be unloaded. What are those conditions?

April 26, 2017certain Conditions device driver OS Solaris unloaded

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Under certain conditions on the Solaris OS, a device driver cannot be unloaded. What are those conditions?

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• If a driver has no detach routine (nodev is specified in the driver’s dev_ops(9S) for its detach routine). • If EBUSY is returned from the driver’s _fini() routine. • If the driver has a positive number of references to it. • If the driver has a bus_ops structure specified in its dev_ops structure, and it has children attached to it (therefore it is a nexus driver). • If the driver has no dev_ops at all!Source: http://developers.sun.com/solaris/developer/support/driver/faqs.html#QA3.