Re: [linux-pm] Is it supposed to be ok to call del_gendisk whileuserspace is frozen?

From: Pavel Machek
Date: Thu Mar 04 2010 - 08:53:43 EST


> > journalling assumptions broken: commit block is there, but previous
> > blocks are not intact. Data loss.
> >
> > ...and that was the first I could think about. Lets not do
> > this. Barriers were invented for a reason.
> Very well. Then we still need a solution to the original problem:
> Devices sometimes need to be unregistered during resume, but
> del_gendisk() blocks on the writeback thread, which is frozen until
> after the resume finishes. How do you suggest this be fixed?

Avoid unregistering device during resume. Instead, return errors until
resume is done and you can call del_gendisk?

(cesky, pictures)
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