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Re: CVS commit: src/sys/dev

On Tue, Apr 07, 2009 at 10:30:09PM +0000, David Young wrote:

> Modified Files:
>       src/sys/dev/ic: attimer.c attimervar.h
>       src/sys/dev/isa: pcppi.c
> Log Message:
> Make pcppi(4) detach the "speaker" from attimer(4), so that the
> corresponding attimer(4) resource is not perpetually busy: now it
> is possible to detach and to reattach pcppi(4).  Make attimer(4)'s
> device-detachment hook return EBUSY if pcppi(4) is still attached, so
> that pcppi(4) cannot end up with a dangling pointer to attimer(4).

pcppi_bell() can race with pcppi_detach() -> pcppi_bell_stop()

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