Re: [RFC Add no_suspend attribute V2] Let the driver know if it's in use

[Michael Trimarchi <trimarchi@gandalf.sssup.it>]

Hi,
Alan Stern wrote:
> On Sat, 25 Apr 2009, Michael Trimarchi wrote:
>
>   
>> Ok, I understand, so how to know the devices dependences? There is a way 
>> to express
>> this relation? Because if it is not possible a single flag can be used
>>     
>
> Nobody knows all the device dependencies.  That's why we're afraid that 
> if you change the list, something will break.
>
>   
But this happen for broken device? The list is a sufficient condition 
for correct
suspend phase but is not necesarry, because all the dependence are not 
registerd.
But just to understand: What are the typical situation, because I 
suppose that
we are not talking about broken device.
>>> This will set the dont_suspend flag for all devices in the subtree 
>>> starting at topdev.
>>>   
>>>       
>> Yes this is possible, but you walk all list twice.
>>     
>
> So what?  Walking the list is very quick, and you're not on a 
> time-critical path.
>
>   
Yes, you are right, I will submit a new patch with all the necessary fixes
> Alan Stern
>
>
>   
Thanks