cvs commit: src/sys/dev/ed if_ed.c if_ed_pccard.c if_edvar.h

Ruslan Ermilov ru at
Mon Sep 19 07:54:42 PDT 2005

On Mon, Sep 19, 2005 at 08:31:11AM -0600, M. Warner Losh wrote:
> In message: <20050919054051.GB65954 at>
>             Ruslan Ermilov <ru at> writes:
> : About the commonality...  Usually foo_stop() (which is called first in
> : foo_detach() if you were talking about the detach) disables interrupts,
> : so foo_intr() doesn't usually happen.  From reading the code, I see the
> : same holds true for ed(4).
> Wrong.  Foo_intr() does still happen because other devices can
> generate interrupts...
Ah, you're right, I missed this bit.  :-)

> : OTOH, it was shown that on some SMP machines it's possible to get a
> : call to foo_intr() after foo_stop() has been called by foo_shutdown(),
> : which will lead to a panic in most of the drivers.  See kern/85005 and
> : kern/62889 for some examples.
> : 
> : I think the generic solution to this problem should be to return from
> : foo_intr() quickly if IFF_DRV_RUNNING is not set.
> Only if we free ifp after we tear down the interrupts.

Ruslan Ermilov
ru at
FreeBSD committer
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