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SubjectRe: [PATCH] EVMS core (3/9) discover.c

On 10/10/2002 at 05:19 PM, Andi Kleen wrote:

> > We plan to register a "__this_module.can_unload()" that
> > should prevent plugin modules from unloading during
> > discovery.

> Ok in this case. But how about when you search that list later after
> discovery for some reason and drop the lock. Then you could race with
> else removing the plugin inbetween, no ?

The only time the lock is released while actively
searching the list is during discovery and direct
ioctl communication. So yes, you are correct, the
can_unload() would have to take both operations
into account. All other list operations take
place completely inside the lock. All in-use
plugins are kept from unloading by module ref
counts. Outside of the scope of the discover and
direct ioctl operations, any unused plugins
should be safe to unload.

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