"Rafael J. Wysocki" [off-list ref] writes:

On Thursday, October 30, 2014 01:02:49 PM Ulf Hansson wrote:

quoted

Convert the prototype to return and int. This is just an initial step,
needed to support error handling.

Signed-off-by: Ulf Hansson <redacted>

Acked-by: Kevin Hilman <redacted>

quoted

This patch is intended as fix for 3.18 rc[n]. Why?

There are other SOC specific patches around that adds genpd support and which
implements the ->attach_dev() callback. To prevent having an "atomic" patch
during the next release cycle, let's change the prototype now instead.

Further patches will add the actual error handling in genpd and these can then
be reviewed and tested thoroughly.

So we have no users of ->attach_dev at the moment, right?

Not in mainline, but there are a couple getting ready to hit -next, so
we wanted to fix this before they arrive so that adding the error
handling will be easier.

Kevin