linux-kernel - Re: [Bugfix] unregister_trace_probe needs to be called under mutex

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Date:	Wed, 30 Jun 2010 16:19:34 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [Bugfix] unregister_trace_probe needs to be called under mutex

> > diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> > index 4f11a56..67670cd 100644
> > --- a/kernel/trace/trace_kprobe.c
> > +++ b/kernel/trace/trace_kprobe.c
> > @@ -269,14 +269,17 @@ static int create_trace_probe(int argc, char **argv)
> >  			pr_info("Delete command needs an event name.\n");
> >  			return -EINVAL;
> >  		}
> > +		mutex_lock(&probe_lock);
> >  		tp = find_probe_event(event, group);
> >  		if (!tp) {
> > +			mutex_unlock(&probe_lock);
> >  			pr_info("Event %s/%s doesn't exist.\n", group, event);
> >  			return -ENOENT;
> >  		}
> >  		/* delete an event */
> >  		unregister_trace_probe(tp);
> >  		free_trace_probe(tp);
> > +		mutex_unlock(&probe_lock);
> >  		return 0;
> >  	}
> 
> Shouldn't all that go through steven's ->reg() interface?

Currently the ->reg() interface does a enable/disable of the
probe_events. Infact the reg callback gets set in
register_trace_probe() function which inturn gets called from the
create_trace_probe().

Do we have plans to move probe_events creation to ->reg()
interface?

--
Regards
Srikar

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