[PATCH 0/4] add missing of_node_puts

[PATCH 0/4] add missing of_node_puts

[Julia Lawall]

The device node iterators perform an of_node_get on each iteration, so a
jump out of the loop requires an of_node_put.

The patches for drivers/gpu/drm/imx/imx-ldb.c and
drivers/gpu/drm/sun4i/sun4i_backend.c contain some added of_node_puts for
which the need was identified manually.  Details are in the patch logs.

---

 drivers/gpu/drm/imx/imx-ldb.c           |   25 +++++++++++++++++--------
 drivers/gpu/drm/mediatek/mtk_drm_drv.c  |    5 ++++-
 drivers/gpu/drm/rockchip/rockchip_rgb.c |    4 +++-
 drivers/gpu/drm/sun4i/sun4i_backend.c   |    1 +
 4 files changed, 25 insertions(+), 10 deletions(-)
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[PATCH 3/4] drm/rockchip: add missing of_node_put

[Julia Lawall]

The device node iterators perform an of_node_get on each iteration, so a
jump out of the loop requires an of_node_put.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
expression root,e;
local idexpression child;
iterator name for_each_child_of_node;
@@

 for_each_child_of_node(root, child) {
   ... when != of_node_put(child)
       when != e = child
+  of_node_put(child);
?  break;
   ...
}
... when != child
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/gpu/drm/rockchip/rockchip_rgb.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_rgb.c b/drivers/gpu/drm/rockchip/rockchip_rgb.c
index 96ac145..37f9302 100644
--- a/drivers/gpu/drm/rockchip/rockchip_rgb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_rgb.c
@@ -113,8 +113,10 @@ struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
 		child_count++;
 		ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
 						  &panel, &bridge);
-		if (!ret)
+		if (!ret) {
+			of_node_put(endpoint);
 			break;
+		}
 	}
 
 	of_node_put(port);

Re: [PATCH 3/4] drm/rockchip: add missing of_node_put

[Heiko Stuebner]

Am Sonntag, 13. Januar 2019, 09:47:43 CET schrieb Julia Lawall:
> The device node iterators perform an of_node_get on each iteration, so a
> jump out of the loop requires an of_node_put.
> 
> The semantic patch that fixes this problem is as follows
> (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> expression root,e;
> local idexpression child;
> iterator name for_each_child_of_node;
> @@
> 
>  for_each_child_of_node(root, child) {
>    ... when != of_node_put(child)
>        when != e = child
> +  of_node_put(child);
> ?  break;
>    ...
> }
> ... when != child
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

I've added a fixes+stable tag and applied it to drm-misc-fixes

Thanks for catching that
Heiko


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Re: [PATCH 3/4] drm/rockchip: add missing of_node_put

[Daniel Vetter]

On Sun, Jan 13, 2019 at 07:48:49PM +0100, Heiko Stuebner wrote:
> Am Sonntag, 13. Januar 2019, 09:47:43 CET schrieb Julia Lawall:
> > The device node iterators perform an of_node_get on each iteration, so a
> > jump out of the loop requires an of_node_put.
> > 
> > The semantic patch that fixes this problem is as follows
> > (http://coccinelle.lip6.fr):
> > 
> > // <smpl>
> > @@
> > expression root,e;
> > local idexpression child;
> > iterator name for_each_child_of_node;
> > @@
> > 
> >  for_each_child_of_node(root, child) {
> >    ... when != of_node_put(child)
> >        when != e = child
> > +  of_node_put(child);
> > ?  break;
> >    ...
> > }
> > ... when != child
> > // </smpl>
> > 
> > Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> I've added a fixes+stable tag and applied it to drm-misc-fixes

All of them or just this one here? These cleanup patches have a high
chance of falling through cracks, so taking them all usually works out
better ...
-Daniel

> 
> Thanks for catching that
> Heiko
> 
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH 3/4] drm/rockchip: add missing of_node_put

[Heiko Stuebner]

Am Montag, 14. Januar 2019, 11:05:56 CET schrieb Daniel Vetter:
> On Sun, Jan 13, 2019 at 07:48:49PM +0100, Heiko Stuebner wrote:
> > Am Sonntag, 13. Januar 2019, 09:47:43 CET schrieb Julia Lawall:
> > > The device node iterators perform an of_node_get on each iteration, so a
> > > jump out of the loop requires an of_node_put.
> > > 
> > > The semantic patch that fixes this problem is as follows
> > > (http://coccinelle.lip6.fr):
> > > 
> > > // <smpl>
> > > @@
> > > expression root,e;
> > > local idexpression child;
> > > iterator name for_each_child_of_node;
> > > @@
> > > 
> > >  for_each_child_of_node(root, child) {
> > >    ... when != of_node_put(child)
> > >        when != e = child
> > > +  of_node_put(child);
> > > ?  break;
> > >    ...
> > > }
> > > ... when != child
> > > // </smpl>
> > > 
> > > Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
> > 
> > I've added a fixes+stable tag and applied it to drm-misc-fixes
> 
> All of them or just this one here? These cleanup patches have a high
> chance of falling through cracks, so taking them all usually works out
> better ...

That is the only one I got, so right now I only applied this one in my inbox.
Weekend and such resulted in me not going looking for other ones.

Heiko


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