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of/irq: add missing of_node_put 

for_each_matching_node 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>
@@
local idexpression n;
expression e;
identifier l;
@@

 for_each_matching_node(n,...) {
   ...
(
   of_node_put(n);
|
   e = n
|
+  of_node_put(n);
?  goto l;
)
   ...
 }
...
l: ... when != n
// </smpl>

Besides the issue found by the semantic patch, this code also stores the
device_node value in a list, which requires an of_node_get, and then cleans
up the list on exit from the function, which requires an of_node_put.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Julia Lawall 2015-10-22 11:02:51 +02:00 committed by Rob Herring
parent 855ff2878e
commit 8363ccb917
1 changed files with 5 additions and 2 deletions
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7
drivers/of/irq.c
View File

@ -501,10 +501,12 @@ void __init of_irq_init(const struct of_device_id *matches)
* pointer, interrupt-parent device_node etc.
*/
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (WARN_ON(!desc))
if (WARN_ON(!desc)) {
of_node_put(np);
goto err;
}
desc->dev = np;
desc->dev = of_node_get(np);
desc->interrupt_parent = of_irq_find_parent(np);
if (desc->interrupt_parent == np)
desc->interrupt_parent = NULL;
@ -575,6 +577,7 @@ void __init of_irq_init(const struct of_device_id *matches)
err:
list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
list_del(&desc->list);
of_node_put(desc->dev);
kfree(desc);
}
}