Messages in this thread | | | Date | Thu, 3 May 2012 17:30:30 -0400 (EDT) | From | Alan Stern <> | Subject | Re: Lockdep false positive in sysfs |
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On Fri, 27 Apr 2012, Tejun Heo wrote:
> > Would it be better to release just the lockdep annotation while > > continuing to hold the actual lock, or to really drop the lock? > > Just the lockdep annotation, I think.
This is turning out to be harder than it looked.
In order to release the lockdep annotation, I need the lockdep_map which is stored in the sysfs_dirent structure. But when the attribute method is called, all it is given is a pointer to the attribute itself (which contains the lockdep_class_key but not the lockdep_map) and a pointer to the corresponding kobject.
Is there any reasonable way to get from the kobject and the attribute to the appropriate sysfs_dirent? Search through all the groups attached to the kobject? Restrict the new interface so that it can be used only by attributes at the kobject's top level (i.e., not in a named group)?
Any suggestions?
Alan Stern
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