From: Johan Hovold Date: Sat, 11 Nov 2017 15:38:43 +0000 (+0100) Subject: mfd: twl4030-audio: Fix sibling-node lookup X-Git-Tag: v3.18.91~30 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d3cc4822354dd4d4fd0601bb0c794ce536ee7c37;p=thirdparty%2Fkernel%2Fstable.git mfd: twl4030-audio: Fix sibling-node lookup commit 0a423772de2f3d7b00899987884f62f63ae00dcb upstream. A helper purported to look up a child node based on its name was using the wrong of-helper and ended up prematurely freeing the parent of-node while leaking any matching node. To make things worse, any matching node would not even necessarily be a child node as the whole device tree was searched depth-first starting at the parent. Fixes: 019a7e6b7b31 ("mfd: twl4030-audio: Add DT support") Signed-off-by: Johan Hovold Acked-by: Peter Ujfalusi Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/mfd/twl4030-audio.c b/drivers/mfd/twl4030-audio.c index 07fe542e6fc00..9372f5e6b6778 100644 --- a/drivers/mfd/twl4030-audio.c +++ b/drivers/mfd/twl4030-audio.c @@ -159,13 +159,18 @@ unsigned int twl4030_audio_get_mclk(void) EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk); static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata, - struct device_node *node) + struct device_node *parent) { + struct device_node *node; + if (pdata && pdata->codec) return true; - if (of_find_node_by_name(node, "codec")) + node = of_get_child_by_name(parent, "codec"); + if (node) { + of_node_put(node); return true; + } return false; }