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[PATCH 1/5] clk: add missing of_node_put

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  [PATCH 1/5] clk: add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-21 23:00 +0200
    Re: [PATCH 1/5] clk: add missing of_node_put Stephen Boyd <sboyd@codeaurora.org> - 2015-10-22 01:20 +0200
      Re: [PATCH 1/5] clk: add missing of_node_put Julia Lawall <julia.lawall@lip6.fr> - 2015-10-22 08:00 +0200

#1253243 — [PATCH 1/5] clk: add missing of_node_put

for_each_matching_node_and_match performs an of_node_get on each iteration,
so a break out of the loop requires an of_node_put.

A simplified version of the semantic patch that fixes this problem is as
follows (http://coccinelle.lip6.fr):

// <smpl>
@@
expression e1,e2,e;
local idexpression np;
@@

 for_each_matching_node_and_match(np, e1, e2) {
   ... when != of_node_put(np)
       when != e = np
(
   return np;
|
+  of_node_put(np);
?  return ...;
)
   ...
 }
// </smpl>

Besides the problem identified by the semantic patch, this patch adds an
of_node_get in front of saving np in a field of parent, to account for the
fact that this value will be put on going on to the next element in the
iteration, and then adds of_node_puts in the two loops where the parent
pointer can be freed.

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

---
 drivers/clk/clk.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index e735eab..11babd1 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3200,12 +3200,15 @@ void __init of_clk_init(const struct of_device_id *matches)
 			list_for_each_entry_safe(clk_provider, next,
 						 &clk_provider_list, node) {
 				list_del(&clk_provider->node);
+				of_node_put(clk_provider->np);
 				kfree(clk_provider);
 			}
+			of_node_put(np);
 			return;
 		}
 
 		parent->clk_init_cb = match->data;
+		of_node_get(np);
 		parent->np = np;
 		list_add_tail(&parent->node, &clk_provider_list);
 	}
@@ -3220,6 +3223,7 @@ void __init of_clk_init(const struct of_device_id *matches)
 				of_clk_set_defaults(clk_provider->np, true);
 
 				list_del(&clk_provider->node);
+				of_node_put(clk_provider->np);
 				kfree(clk_provider);
 				is_init_done = true;
 			}

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#1253342

On 10/21, Julia Lawall wrote:
> for_each_matching_node_and_match performs an of_node_get on each iteration,
> so a break out of the loop requires an of_node_put.
> 
> A simplified version of the semantic patch that fixes this problem is as
> follows (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> expression e1,e2,e;
> local idexpression np;
> @@
> 
>  for_each_matching_node_and_match(np, e1, e2) {
>    ... when != of_node_put(np)
>        when != e = np
> (
>    return np;
> |
> +  of_node_put(np);
> ?  return ...;
> )
>    ...
>  }
> // </smpl>
> 
> Besides the problem identified by the semantic patch, this patch adds an
> of_node_get in front of saving np in a field of parent, to account for the
> fact that this value will be put on going on to the next element in the
> iteration, and then adds of_node_puts in the two loops where the parent
> pointer can be freed.
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> ---

Applied to clk-next, except I collapsed the of_node_get() into
the assignment.

---8<---
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d366bfb66c58..2eae76f21d6f 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3205,8 +3205,7 @@ void __init of_clk_init(const struct of_device_id *matches)
 		}
 
 		parent->clk_init_cb = match->data;
-		of_node_get(np);
-		parent->np = np;
+		parent->np = of_node_get(np);
 		list_add_tail(&parent->node, &clk_provider_list);
 	}
 

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#1253493

On Wed, 21 Oct 2015, Stephen Boyd wrote:

> On 10/21, Julia Lawall wrote:
> > for_each_matching_node_and_match performs an of_node_get on each iteration,
> > so a break out of the loop requires an of_node_put.
> > 
> > A simplified version of the semantic patch that fixes this problem is as
> > follows (http://coccinelle.lip6.fr):
> > 
> > // <smpl>
> > @@
> > expression e1,e2,e;
> > local idexpression np;
> > @@
> > 
> >  for_each_matching_node_and_match(np, e1, e2) {
> >    ... when != of_node_put(np)
> >        when != e = np
> > (
> >    return np;
> > |
> > +  of_node_put(np);
> > ?  return ...;
> > )
> >    ...
> >  }
> > // </smpl>
> > 
> > Besides the problem identified by the semantic patch, this patch adds an
> > of_node_get in front of saving np in a field of parent, to account for the
> > fact that this value will be put on going on to the next element in the
> > iteration, and then adds of_node_puts in the two loops where the parent
> > pointer can be freed.
> > 
> > Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
> > 
> > ---
> 
> Applied to clk-next, except I collapsed the of_node_get() into
> the assignment.
> 
> ---8<---
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index d366bfb66c58..2eae76f21d6f 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -3205,8 +3205,7 @@ void __init of_clk_init(const struct of_device_id *matches)
>  		}
>  
>  		parent->clk_init_cb = match->data;
> -		of_node_get(np);
> -		parent->np = np;
> +		parent->np = of_node_get(np);

Thanks!

julia

>  		list_add_tail(&parent->node, &clk_provider_list);
>  	}
>  
> 
> -- 
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
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> To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in
> the body of a message to majordomo@vger.kernel.org
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> 
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