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SubjectRe: Proposed changes for libata speed handling
BTW, for a solution to be complete, we need to halt all work on all 
other ports, when issuing SET FEATURES - XFER MODE. On SiI and Promise
controllers, possibly others, the command is snooped and side effects
such as register setting occur.

Long standing to-do. Currently we hack around this by serializing the
bus probe, and preventing people from issuing SET FEATURES - XFER MODE
from userspace.

Jeff



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