Re: ahci power management

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Johannes Hofmann wrote:
> In which context are sysctl callbacks run? How would I avoid races
> when modifying flags or accessing registers (to disable the PRCE intr
> for example)? 

In the context of the calling thread, with the mp lock held.

> Maybe setting flags with with atomic operations and do the real work
> in the per port thread?

You could send a message to the port thread which in turn does all the work, without changing anything from within the sysctl.

cheers
 simon