[PATCH 1/2] perf: allow add to change event state

On Fri, Jun 03, 2016 at 05:03:31PM -0400, Neil Leeder wrote:

When the platform-specific pmu->add function returns
an error, it may have also changed the event's state.
If so, do not override that new state.

This is inadequate; it fails to what the problem is and why this is a
good solution.