The patch
device property: Fix usecount for of_graph_get_port_parent()
has been applied to the asoc tree at
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.
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Thanks,
Mark
>From c0a480d1acf7dc184f9f3e7cf724483b0d28dc2e Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@xxxxxxxxxxx>
Date: Fri, 28 Jul 2017 01:23:15 -0700
Subject: [PATCH] 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@xxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Tested-by: Antonio Borneo <borneo.antonio@xxxxxxxxx>
Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/of/property.c | 17 +++++++++++++++--
sound/soc/generic/audio-graph-card.c | 10 +++++-----
sound/soc/generic/audio-graph-scu-card.c | 15 +++++++++------
sound/soc/generic/simple-card-utils.c | 8 +++-----
sound/soc/soc-core.c | 2 ++
5 files changed, 34 insertions(+), 18 deletions(-)
diff --git a/drivers/of/property.c b/drivers/of/property.c
index eda50b4be934..067f9fab7b77 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -708,6 +708,15 @@ struct device_node *of_graph_get_port_parent(struct device_node *node)
{
unsigned int depth;
+ if (!node)
+ return NULL;
+
+ /*
+ * Preserve usecount for passed in node as of_get_next_parent()
+ * will do of_node_put() on it.
+ */
+ of_node_get(node);
+
/* Walk 3 levels up only if there is 'ports' node. */
for (depth = 3; depth && node; depth--) {
node = of_get_next_parent(node);
@@ -728,12 +737,16 @@ EXPORT_SYMBOL(of_graph_get_port_parent);
struct device_node *of_graph_get_remote_port_parent(
const struct device_node *node)
{
- struct device_node *np;
+ struct device_node *np, *pp;
/* Get remote endpoint node. */
np = of_graph_get_remote_endpoint(node);
- return of_graph_get_port_parent(np);
+ pp = of_graph_get_port_parent(np);
+
+ of_node_put(np);
+
+ return pp;
}
EXPORT_SYMBOL(of_graph_get_remote_port_parent);
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);
--
2.13.2
--
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