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authorTony Lindgren <tony@atomide.com>2017-07-28 11:23:15 +0300
committerMark Brown <broonie@kernel.org>2017-08-01 17:15:42 +0300
commitc0a480d1acf7dc184f9f3e7cf724483b0d28dc2e (patch)
tree0c4d178bc64d97ba035fa18a91ad519f2c670717 /sound
parent5771a8c08880cdca3bfb4a3fc6d309d6bba20877 (diff)
downloadlinux-c0a480d1acf7dc184f9f3e7cf724483b0d28dc2e.tar.xz
device property: Fix usecount for of_graph_get_port_parent()
Fix inconsistent use of of_graph_get_port_parent() where asoc_simple_card_parse_graph_dai() does of_node_get() before calling it while other callers do not. We can fix this by not trashing the node passed to of_graph_get_port_parent(). Let's also make sure the callers have correct refcounts and remove related incorrect of_node_put() calls for of_for_each_phandle as that's done by of_phandle_iterator_next() except when we break out of the loop early. Let's fix both issues with a single patch to avoid kobject refcounts getting messed up more if two patches are merged separately. Otherwise strange issues can happen caused by memory corruption caused by too many kobject_del() calls such as: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:747 ... (___might_sleep) (__mutex_lock) (mutex_lock_nested) (kernfs_remove) (kobject_del) (kobject_put) (of_get_next_parent) (of_graph_get_port_parent) (asoc_simple_card_parse_graph_dai [snd_soc_simple_card_utils]) (asoc_graph_card_probe [snd_soc_audio_graph_card]) Fixes: 0ef472a973eb ("of_graph: add of_graph_get_port_parent()") Fixes: 2692c1c63c29 ("ASoC: add audio-graph-card support") Fixes: 1689333f8311 ("ASoC: simple-card-utils: add asoc_simple_card_parse_graph_dai()") Signed-off-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Rob Herring <robh@kernel.org> Tested-by: Antonio Borneo <borneo.antonio@gmail.com> Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/generic/audio-graph-card.c10
-rw-r--r--sound/soc/generic/audio-graph-scu-card.c15
-rw-r--r--sound/soc/generic/simple-card-utils.c8
-rw-r--r--sound/soc/soc-core.c2
4 files changed, 19 insertions, 16 deletions
diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
index 105ec3a6e30d..de2550c7a96b 100644
--- a/sound/soc/generic/audio-graph-card.c
+++ b/sound/soc/generic/audio-graph-card.c
@@ -224,9 +224,11 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
ret = asoc_graph_card_dai_link_of(it.node, priv, idx++);
- of_node_put(it.node);
- if (ret < 0)
+ if (ret < 0) {
+ of_node_put(it.node);
+
return ret;
+ }
}
return asoc_simple_card_parse_card_name(card, NULL);
@@ -239,10 +241,8 @@ static int asoc_graph_get_dais_count(struct device *dev)
int count = 0;
int rc;
- of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
+ of_for_each_phandle(&it, rc, node, "dais", NULL, 0)
count++;
- of_node_put(it.node);
- }
return count;
}
diff --git a/sound/soc/generic/audio-graph-scu-card.c b/sound/soc/generic/audio-graph-scu-card.c
index dcd2df37bc3b..758ac06f3a99 100644
--- a/sound/soc/generic/audio-graph-scu-card.c
+++ b/sound/soc/generic/audio-graph-scu-card.c
@@ -215,7 +215,6 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
codec_ep = of_graph_get_remote_endpoint(cpu_ep);
rcpu_ep = of_graph_get_remote_endpoint(codec_ep);
- of_node_put(cpu_port);
of_node_put(cpu_ep);
of_node_put(codec_ep);
of_node_put(rcpu_ep);
@@ -232,8 +231,10 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
NULL, &daifmt);
- if (ret < 0)
+ if (ret < 0) {
+ of_node_put(cpu_port);
goto parse_of_err;
+ }
}
dai_idx = 0;
@@ -250,7 +251,6 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
codec_ep = of_graph_get_remote_endpoint(cpu_ep);
codec_port = of_graph_get_port_parent(codec_ep);
- of_node_put(cpu_port);
of_node_put(cpu_ep);
of_node_put(codec_ep);
of_node_put(codec_port);
@@ -266,13 +266,17 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
/* Back-End (= Codec) */
ret = asoc_graph_card_dai_link_of(codec_ep, priv, daifmt, dai_idx++, 0);
- if (ret < 0)
+ if (ret < 0) {
+ of_node_put(cpu_port);
goto parse_of_err;
+ }
} else {
/* Front-End (= CPU) */
ret = asoc_graph_card_dai_link_of(cpu_ep, priv, daifmt, dai_idx++, 1);
- if (ret < 0)
+ if (ret < 0) {
+ of_node_put(cpu_port);
goto parse_of_err;
+ }
}
}
}
@@ -306,7 +310,6 @@ static int asoc_graph_get_dais_count(struct device *dev)
codec_ep = of_graph_get_remote_endpoint(cpu_ep);
codec_port = of_graph_get_port_parent(codec_ep);
- of_node_put(cpu_port);
of_node_put(cpu_ep);
of_node_put(codec_ep);
of_node_put(codec_port);
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 26d64fa40c9c..7d7ab4aee42e 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -263,6 +263,9 @@ static int asoc_simple_card_get_dai_id(struct device_node *ep)
id = i;
i++;
}
+
+ of_node_put(node);
+
if (id < 0)
return -ENODEV;
@@ -282,11 +285,6 @@ int asoc_simple_card_parse_graph_dai(struct device_node *ep,
if (!dai_name)
return 0;
- /*
- * 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);
/* Get dai->name */
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 921622a01944..0cf8498fa36c 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -4113,6 +4113,8 @@ int snd_soc_get_dai_id(struct device_node *ep)
}
mutex_unlock(&client_mutex);
+ of_node_put(node);
+
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_get_dai_id);