From: fche@redhat.com (Frank Ch. Eigler)
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Daniel Walker <dwalker@mvista.com>,
Jon Masters <jonathan@jonmasters.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: try_module_get and friends
Date: Wed, 05 Mar 2008 15:46:59 -0500 [thread overview]
Message-ID: <y0mr6eo99vg.fsf@ton.toronto.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0803051442330.15217@gandalf.stny.rr.com> (Steven Rostedt's message of "Wed, 5 Mar 2008 14:47:28 -0500 (EST)")
Steven Rostedt <rostedt@goodmis.org> writes:
> [...]
> There's a theoretical potential for the system to crash in -rt when
> unloading a module. Simply because interrupts are threads.
>
> Some device has an interrupt handler that is called and preempted.
> At that moment the module for that device is unloaded. [...]
> Since the code for the interrupt handler no longer exists... KABOOM!
Perhaps you can identify those modules that have asked for interrupts,
and block only them from unloading. Or, would it be outrageously
expensive to increment the module refcount while one of its interrupt
handlers is running?
- FChE
next prev parent reply other threads:[~2008-03-05 20:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-04 5:20 try_module_get and friends Jon Masters
2008-03-04 5:28 ` Jon Masters
2008-03-04 20:07 ` Jon Masters
2008-03-05 19:30 ` Daniel Walker
2008-03-05 19:47 ` Steven Rostedt
2008-03-05 20:28 ` Daniel Walker
2008-03-05 20:46 ` Frank Ch. Eigler [this message]
2008-03-05 20:54 ` Steven Rostedt
2008-03-05 21:15 ` Daniel Walker
2008-03-07 16:16 ` Paul E. McKenney
2008-03-05 21:14 ` Steven Rostedt
2008-03-10 5:53 ` Jon Masters
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