Patch "mfd: twl6040: Fix child-node lookup" has been added to the 3.18-stable tree

Patch "mfd: twl6040: Fix child-node lookup" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mfd: twl6040: Fix child-node lookup

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mfd-twl6040-fix-child-node-lookup.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 85e9b13cbb130a3209f21bd7933933399c389ffe Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Sat, 11 Nov 2017 16:38:44 +0100
Subject: mfd: twl6040: Fix child-node lookup

From: Johan Hovold <johan@kernel.org>

commit 85e9b13cbb130a3209f21bd7933933399c389ffe upstream.

Fix child-node lookup during probe, which ended up searching the whole
device tree depth-first starting at the parent rather than just matching
on its children.

To make things worse, the parent node was prematurely freed, while the
child node was leaked.

Note that the CONFIG_OF compile guard can be removed as
of_get_child_by_name() provides a !CONFIG_OF implementation which always
fails.

Fixes: 37e13cecaa14 ("mfd: Add support for Device Tree to twl6040")
Fixes: ca2cad6ae38e ("mfd: Fix twl6040 build failure")
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mfd/twl6040.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/mfd/twl6040.c
+++ b/drivers/mfd/twl6040.c
@@ -97,12 +97,16 @@ static struct reg_default twl6040_patch[
 };
 
 
-static bool twl6040_has_vibra(struct device_node *node)
+static bool twl6040_has_vibra(struct device_node *parent)
 {
-#ifdef CONFIG_OF
-	if (of_find_node_by_name(node, "vibra"))
+	struct device_node *node;
+
+	node = of_get_child_by_name(parent, "vibra");
+	if (node) {
+		of_node_put(node);
 		return true;
-#endif
+	}
+
 	return false;
 }
 


Patches currently in stable-queue which might be from johan@kernel.org are

queue-3.18/mfd-twl4030-audio-fix-sibling-node-lookup.patch
queue-3.18/mfd-twl6040-fix-child-node-lookup.patch