The vmware vmmon driver used to use si_drv1 but suddenly it appears to
have already been used (at least it is no-longer non-zero).
It would fail to open because it checks it before using it during open.
Changing the driver to use si_drv2 fixes the problem. 

Since drv1 is defined as 'for the use of the driver'
I am not sure that it is wrong for the driver to use it.
In fact many other drivers do use it without testing it.

I see it's used in freedev() and make_dev_alias().
Is it safe for the driver to use it even if it is non-zero?

      __--_|\  Julian Elischer
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    (   OZ    ) World tour 2000-2001
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