linux-kernel - Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

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Message-Id: <E1I5fug-0003ZS-00@dorka.pomaz.szeredi.hu>
Date:	Tue, 03 Jul 2007 12:47:18 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	oliver@...kum.org
CC:	linux-pm@...ts.linux-foundation.org, benh@...nel.crashing.org,
	nigel@...el.suspend2.net, mjg59@...f.ucam.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

> > So to summarize, the plan that makes things work with fuse is:
> > 
> >  - For STR, don't do the freezer thing.
> > 
> >  - For STD, don't sys_sync() after you froze
> > 
> > There might be -other- issues, but that should get you through some of
> 
> At the risk of repeating myself. Character device drivers are written
> with the assumption that normal io and suspend/resume do not race
> with each other due to the freezer.
> What do you intend to do about that?

Oliver, can you please explain your worries in a bit more detail?

I don't claim to know anything about how STR or hibernate works, but
neither seem to have any problem with I/O on the fuse device "racing"
with them.

And conceptually I can't see anything that would cause trouble either.
The fuse kernel module just provides a specialized IPC mechanism,
where one userspace process communicates with another using file
operations and a char dev.

Miklos
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