From: Antonio Borneo <borneo.anto...@gmail.com> On Hikey target board, enabling CONFIG_OF_DYNAMIC triggers several errors at kernel boot, like the following one OF: ERROR: Bad of_node_put() on /soc/i2s@f7118000/ports/port@0/endpoint each followed by stack dump.
of_graph_get_port_parent() walks through the parents looking for a node named "ports". At each step it uses of_get_next_parent() that drops the current node with of_node_put(). Avoid dropping the initial node by calling of_node_get() before of_graph_get_port_parent(). Tested with kernel v4.13-rc2 with hikey_defconfig taken from https://git.linaro.org/people/john.stultz/android-dev.git branch dev/hikey-mainline-WIP This fixes commit 1689333f8311 ("ASoC: simple-card-utils: add asoc_simple_card_parse_graph_dai()"). Signed-off-by: Antonio Borneo <borneo.anto...@gmail.com> --- To: Liam Girdwood <lgirdw...@gmail.com> To: Mark Brown <broo...@kernel.org> To: Jaroslav Kysela <pe...@perex.cz> To: Takashi Iwai <ti...@suse.com> To: alsa-de...@alsa-project.org Cc: linux-kernel@vger.kernel.org Cc: Wei Xu <xuw...@hisilicon.com> Cc: John Stultz <john.stu...@linaro.org> Cc: linux-arm-ker...@lists.infradead.org Cc: Kuninori Morimoto <kuninori.morimoto...@renesas.com> --- sound/soc/generic/simple-card-utils.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c index 26d64fa..144954b 100644 --- a/sound/soc/generic/simple-card-utils.c +++ b/sound/soc/generic/simple-card-utils.c @@ -250,6 +250,11 @@ static int asoc_simple_card_get_dai_id(struct device_node *ep) if (ret != -ENOTSUPP) return ret; + /* + * of_graph_get_port_parent() will call + * of_node_put(). So, call of_node_get() here + */ + of_node_get(ep); node = of_graph_get_port_parent(ep); /* -- 1.9.1
