PROBLEM:  (77506, 77655) (PATCH ID: OSF505-064)
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This patch fixes a number of problems in the driver shutdown path. All the
problems would result in a kernel memory fault panic but that panic might
not manifest itself until the driver was restarted.

This patch also enhances the driver by making the following changes:

   - The deferred interrupt processing path (attribute minimal_isr set
     to 1) has been modified to perform much better.  This method of handling
     interrupts is now the default.

   - The time between when an adapter receives a frame and when it generates
     an interrupt to the host system has been shortened from 768 to 100
     microseconds.  This reduces the receive processing latency.

   - The model number string which prints out when the adapter is configured
     will display the -UA or -FA extension, reflecting the type of media
     used by the adapter.