From 461d854c0dba3cdf63cce37ffb9423eca0793a47 Mon Sep 17 00:00:00 2001 From: Daniel Baluta Date: Sat, 16 Feb 2019 10:09:42 +0000 Subject: ASoC: simple-card: Fix refcount underflow of_get_child_by_name() takes a reference we'll need to drop later so when we substitute in top we need to take a reference as well as just assigning. Without this patch we hit the following error: [ 1.246852] OF: ERROR: Bad of_node_put() on /sound-wm8524 [ 1.262261] Hardware name: NXP i.MX8MQ EVK (DT) [ 1.266807] Workqueue: events deferred_probe_work_func [ 1.271950] Call trace: [ 1.274406] dump_backtrace+0x0/0x158 [ 1.278074] show_stack+0x14/0x20 [ 1.281396] dump_stack+0xa8/0xcc [ 1.284717] of_node_release+0xb0/0xc8 [ 1.288474] kobject_put+0x74/0xf0 [ 1.291879] of_node_put+0x14/0x28 [ 1.295286] __of_get_next_child+0x44/0x70 [ 1.299387] of_get_next_child+0x3c/0x60 [ 1.303315] simple_for_each_link+0x1dc/0x230 [ 1.307676] simple_probe+0x80/0x540 [ 1.311256] platform_drv_probe+0x50/0xa0 This patch is based on an earlier version posted by Kuninori Morimoto and commit message includes explanations from Mark Brown. https://patchwork.kernel.org/patch/10814255/ Reported-by: Vicente Bergas Signed-off-by: Daniel Baluta Signed-off-by: Mark Brown --- sound/soc/generic/simple-card.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'sound/soc/generic') diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c index 08df261024cf..dc18c4492955 100644 --- a/sound/soc/generic/simple-card.c +++ b/sound/soc/generic/simple-card.c @@ -445,7 +445,7 @@ static int simple_for_each_link(struct simple_priv *priv, /* Check if it has dai-link */ node = of_get_child_by_name(top, PREFIX "dai-link"); if (!node) { - node = top; + node = of_node_get(top); is_top = 1; } -- cgit v1.2.3