Messages in this thread | | | Subject | Re: [PATCH 2.6.16-rc1-git4] accessfs: a permission managing filesystem | From | Arjan van de Ven <> | Date | Mon, 30 Jan 2006 11:39:10 +0100 |
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On Mon, 2006-01-30 at 11:36 +0100, Jan Engelhardt wrote: > > > >well... maybe. > >If you need to mess inside irq context, spinlocks sound more the right > >thing. Or if you need to do a "I'm done" in the irq and a "sleep until > >done" thing in process context, then you really should use completions > >instead. > > Hm, is it allowed to call copy_{from,to}_user() in irq context?
absolutely not.
IRQ context has no defined "userspace" context at all, so even if copy_from/to_user wouldn't sleep (they do, and that alone makes it "illegal" to do already) it would be highly undefined what you would be copying to/from.
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