Thread (4 messages) 4 messages, 3 authors, 2016-01-28

Re: [PATCH] input: keyboard: cap11xx: Add missing of_node_put

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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2016-01-27 23:49:05
Also in: lkml

On Mon, Jan 25, 2016 at 09:01:21PM +0530, Amitoj Kaur Chawla wrote:
quoted hunk ↗ jump to hunk
for_each_child_of_node performs an of_node_get on each iteration, so
to break out of the loop an of_node_put is required.

Found using Coccinelle. The semantic patch used for this is as follows:

// <smpl>
@@
expression e;
local idexpression n;
@@

 for_each_child_of_node(..., n) {
   ... when != of_node_put(n)
       when != e = n
(
   return n;
|
+  of_node_put(n);
?  return ...;
)
   ...
 }
// </smpl

Signed-off-by: Amitoj Kaur Chawla <redacted>
---
 drivers/input/keyboard/cap11xx.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/input/keyboard/cap11xx.c b/drivers/input/keyboard/cap11xx.c
index 378db10..27cd7df 100644
--- a/drivers/input/keyboard/cap11xx.c
+++ b/drivers/input/keyboard/cap11xx.c
@@ -304,8 +304,10 @@ static int cap11xx_init_leds(struct device *dev,
 		led->cdev.brightness = LED_OFF;
 
 		error = of_property_read_u32(child, "reg", &reg);
-		if (error != 0 || reg >= num_leds)
-			return -EINVAL;
+		if (error != 0 || reg >= num_leds) {
+			error = -EINVAL;
+			goto putchild;
Instead of jumping to a label I added of_node_put here and also below
and applied, thank you.

I believe there is another input driver that returns from
for_each_child_of_node() without dropping reference.

Thanks.

-- 
Dmitry
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