Messages in this thread | | | Subject | Re: PATCH: Fixes for ide-disk.c | From | Alan Cox <> | Date | 06 Apr 2003 22:00:36 +0100 |
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On Sul, 2003-04-06 at 22:12, Nigel Cunningham wrote: > Hi again. > > I've just reread your message. Isn't it used as a lock at the moment? > IIRC, you get a BUG if you try to use the driver while its blocked. > Perhaps that's where I'm getting confused.
There are multiple "blocked" fields to deal with. drive->blocked indicates we can't feed it commands because it is blocked due to power management.
idedisk_suspend sets the drive->blocked field so that we panic if anything is sent to the disk after we turned it off (since it would be a corrupter).
idedisk_resume is called on the resume path and marks the drive as safe to use.
So if you hit that bug, you did I/O after shutting the drive down, which is not allowed.
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