[PATCH] drm: convert DT component matching to component_match_add_release()

[Liviu Dudau]

On Fri, Jun 03, 2016 at 11:36:33AM +0100, Russell King - ARM Linux wrote:
> On Fri, Jun 03, 2016 at 10:40:48AM +0100, Liviu Dudau wrote:
> > On Fri, Jun 03, 2016 at 08:58:10AM +0100, Russell King wrote:
> > > Convert DT component matching to use component_match_add_release().
> > 
> > Hi Russell,
> > 
> > Any reason for not keeping the component_match_add() calls in the drivers?
> 
> Sorry, I don't understand your comment.

As in: component_match_add() already exists as a macro that calls
component_match_add_release(), but with a NULL release function. If it were
to be changed to pass a default release_of() function then most of the drivers
would not have to change, right? It is just one point of view and I was
curious if there was a reason not to choose it, as it would have (probably)
generated a smaller delta?

> 
> If we kept component_match_add() in these drivers, then this patch
> would not exist, because there wouldn't be any changes to the drivers.
> 
> > Planning to remove it?
> 
> Possibly in the longer term, but at the moment there are drivers where
> the match data that is passed does not need any release functionality
> eg, data allocated with devm_k*alloc(), or
> 
> 	component_match_add(dev->parent, match, dss_component_compare, dev);
> 
> There are some new cases that need converting which have cropped up
> during the last merge window, and I expect this to be an on-going
> educational point for driver authors, so I'm not too bothered about
> capturing all existing cases in this patch.

Understood. Using managed allocators is definitely a strong point in favor
of having the component_match_add() function with a NULL release() hook.

Best regards,
Liviu

> 
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