Re: drm_vm.c:drm_mmap: possible circular locking dependency detected

[Tejun Heo]

Hello,

On 01/05/2010 04:43 AM, Eric W. Biederman wrote:
>>> So it is unlikely but possible to deadlock by accessing a serio
>>> attribute of a serio device that is being removed.
>>
>> Hmm, I guess I was too quick dismissing lockdep complaints here. Now
>> that sysfs remove waits deadlock indeed is possible. Actually the locks
>> on serio->drv_mutex in attributes were added to make sure we don't
>> access device that was unbound from the driver through stale sysfs
>> attributes.
> 
> Cool.  So we have solved the problem generically but we have left over
> layer specific solutions.  That seems like a good problem to have.

This is way too cool.  Only if we can have more moments like this.  :-)

-- 
tejun
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