old rev of Sil 3112 causes hang

[Gary Poppitz]

Another tidbit to save somebody some time. We had a SiiG SC-SAT212 SATA 
card that caused our system to hang. It uses the Silicon Image 3112.

Turns out it was sending interrupts back after a IDENTIFY_DEVICE 
command which the driver ignored. This caused the irq to be shut off 
and then we were hung.

Turns out that the 3112 version was 1.1 but we had another card and its 
3112 was rev 1.21.

This one worked correctly. So, if you have one of these cards, make 
sure the 3112 is at least a 1.21 rev.

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