From: Daniel Walker <dwalker@mvista.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: 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 12:28:14 -0800 [thread overview]
Message-ID: <1204748894.17630.15.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.58.0803051442330.15217@gandalf.stny.rr.com>
On Wed, 2008-03-05 at 14:47 -0500, Steven Rostedt wrote:
> Some device has an interrupt handler that is called and preempted.
> At that moment the module for that device is unloaded. This calls things
> like kstop_machine that should make sure that all interrupt handlers have
> been resolved. But this does not work with -rt, since the interrupt
> handlers can now be preempted and resume after the kstop_machine and the
> moduling being unloaded.
>
> Since the code for the interrupt handler no longer exists... KABOOM!
>
> Enough details?
yeah, you have to assume the device is not in use, but still handling
interrupts?
Daniel
next prev parent reply other threads:[~2008-03-05 20:28 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 [this message]
2008-03-05 20:46 ` Frank Ch. Eigler
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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