On Mon, 29 Oct 2007, Rafael J. Wysocki wrote:

On Monday, 29 October 2007 22:30, Alan Stern wrote:

quoted

Rafael:

How does this patch look?  Any reason not to have the resume notifiers?  

Yes.

The userland interface already uses PM_HIBERNATION_PREPARE and
PM_POST_HIBERNATION for restore too, so if anything, we should call these
from software_resume() either.

I could use those same notifiers, but are you sure that's a good idea?  
Drivers might want to do different things at the beginning of
hibernation and the beginning of a restore.

Alternatively, the user interface can be changed.  The current 
organization is slightly illogical; there should be different ioctls 
for prepare-to-create-snapshot and prepare-to-restore-snapshot instead 
of a single SNAPSHOT_FREEZE for both.  How about adding RESTORE_FREEZE 
and RESTORE_UNFREEZE; does this sound good?

Alan Stern

P.S.: While I'm updating things, the thought occurs that 
PM_RESTORE_PREPARE and PM_POST_RESTORE would be better names than 
PM_RESUME_PREPARE and PM_POST_RESUME.