Messages in this thread | | | Date | Fri, 7 Feb 2014 14:53:13 -0500 | From | Tejun Heo <> | Subject | Re: [PATCH] kernfs: skip lockdep annotation always if ignore_lockdep is set |
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On Fri, Feb 07, 2014 at 09:47:01PM +0200, Imre Deak wrote: > We skip lockdep annotations for sysfs attributes with ignore_lockdep > set. An exception is kernfs_deactivate where we annotate even in this > case. Since the lockdep map key needed for the annotation is not > initialized whenever ignore_lockdep is set, we'll get a warning for > the uninitialized key. > > Note that this happens since, > > commit 517e64f57883bd63c5a4ab8b3d0d3ed68c55d0cf > Author: Tejun Heo <tj@kernel.org> > Date: Thu Nov 28 14:54:29 2013 -0500 > > Before this change we had a valid key even in case of ignore_lockdep, so > the annotation in kernfs_deactivate worked, or at least didn't produce > the above warning. Fix this by skipping the annotation whenever > ignore_lockdep is set. > > The actual attribute triggering the bug was 'delete_device' in > drivers/i2c/i2c-core.c, for the backtrace see the reference below.
I think Greg already has about the same patch queued.
http://lkml.kernel.org/g/20140129170403.GJ30842@htj.dyndns.org
Thanks.
-- tejun
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