Messages in this thread | | | Subject | Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway | From | Benjamin Herrenschmidt <> | Date | Tue, 03 Jul 2007 21:40:26 +1000 |
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On Tue, 2007-07-03 at 09:44 +0200, Oliver Neukum wrote: > Am Dienstag, 3. Juli 2007 schrieb Benjamin Herrenschmidt: > > 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?
Ugh ... "character devices" ... that's a pretty wide statement... there's lots of those and very different one from the other...
Any sane device-driver will have to cope with being suspended in a "live" system. I've demonstrated multiple times in the past why this is necessary anyway, for things like dynamic power management, among others.
The whole freezer thing is a hack job to avoid fixing drivers that need fixing. Unfortunately, I believe in that area, it's simply not sustainable. Besides, getting drivers to behave properly isn't very hard in most cases.
Ben.
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