Re: [PATCH] media: platform: exynos4-is: media-dev: Add missing of_node_put

Mauro Carvalho Chehab
2016-01-26T09:12:50Z

Em Tue, 26 Jan 2016 08:12:15 +0100
Julia Lawall <julia.lawall@lip6.fr> escreveu:

> On Tue, 26 Jan 2016, Krzysztof Kozlowski wrote:
>
> > On 26.01.2016 15:24, Julia Lawall wrote:
> > >
> > >
> > > On Tue, 26 Jan 2016, Krzysztof Kozlowski wrote:
> > >
> > >> On 26.01.2016 00:21, Amitoj Kaur Chawla wrote:
> > >>> for_each_available_child_of_node and for_each_child_of_node perform an
> > >>> of_node_get on each iteration, so to break out of the loop an of_node_put is
> > >>> required.
> > >>>
> > >>> Found using Coccinelle. The simplified version of the semantic patch
> > >>> that is used for this is as follows:
> > >>>
> > >>> // <smpl>
> > >>> @@
> > >>> local idexpression n;
> > >>> expression e,r;
> > >>> @@
> > >>>
> > >>> for_each_available_child_of_node(r,n) {
> > >>> ...
> > >>> (
> > >>> of_node_put(n);
> > >>> |
> > >>> e = n
> > >>> |
> > >>> + of_node_put(n);
> > >>> ? break;
> > >>> )
> > >>> ...
> > >>> }
> > >>> ... when != n
> > >>> // </smpl>
> > >>
> > >> Patch iselft looks correct but why are you pasting coccinelle script
> > >> into the message?
> > >>
> > >> The script is already present in Linux kernel:
> > >> scripts/coccinelle/iterators/device_node_continue.cocci
> > >
> > > I don't think so. The continue one takes care of the case where there is
> > > an extraneous of_node_put before a continue, not a missing one before a
> > > break. But OK to drop it if it doesn't seem useful.
> > >
> > > julia
> >
> > You are right - this is not covered by that cocci patch... but I think
> > is covered by scripts/coccinelle/iterators/fen.cocci, isn't it?
>
> Not quite.

If the script is not part of the Kernel, please keep the script in the
patch, as it could be useful in some future.

Regards,
Mauro