The code for hdac_ext_stream seems inherited from hdac_stream, and
similar locking issues are present: the use of the bus->reg_lock
spinlock is inconsistent, with only writes to specific fields being
protected.
Apply similar fix as in hdac_stream by protecting all accesses to
'link_locked' and 'decoupled' fields, with a new helper
snd_hdac_ext_stream_decouple_locked() added to simplify code
changes.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
include/sound/hdaudio_ext.h | 2 ++
sound/hda/ext/hdac_ext_stream.c | 46 ++++++++++++++++++++-------------
2 files changed, 30 insertions(+), 18 deletions(-)
diff --git a/include/sound/hdaudio_ext.h b/include/sound/hdaudio_ext.h
index 375581634143..d4e31ea16aba 100644
--- a/include/sound/hdaudio_ext.h
+++ b/include/sound/hdaudio_ext.h
@@ -88,6 +88,8 @@ struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_bus *bus,
struct snd_pcm_substream *substream,
int type);
void snd_hdac_ext_stream_release(struct hdac_ext_stream *azx_dev, int type);
+void snd_hdac_ext_stream_decouple_locked(struct hdac_bus *bus,
+ struct hdac_ext_stream *azx_dev, bool decouple);
void snd_hdac_ext_stream_decouple(struct hdac_bus *bus,
struct hdac_ext_stream *azx_dev, bool decouple);
void snd_hdac_ext_stop_streams(struct hdac_bus *bus);
diff --git a/sound/hda/ext/hdac_ext_stream.c b/sound/hda/ext/hdac_ext_stream.c
index 0c005d67fa89..37154ed43bd5 100644
--- a/sound/hda/ext/hdac_ext_stream.c
+++ b/sound/hda/ext/hdac_ext_stream.c
@@ -106,20 +106,14 @@ void snd_hdac_stream_free_all(struct hdac_bus *bus)
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_free_all);
-/**
- * snd_hdac_ext_stream_decouple - decouple the hdac stream
- * @bus: HD-audio core bus
- * @stream: HD-audio ext core stream object to initialize
- * @decouple: flag to decouple
- */
-void snd_hdac_ext_stream_decouple(struct hdac_bus *bus,
- struct hdac_ext_stream *stream, bool decouple)
+void snd_hdac_ext_stream_decouple_locked(struct hdac_bus *bus,
+ struct hdac_ext_stream *stream,
+ bool decouple)
{
struct hdac_stream *hstream = &stream->hstream;
u32 val;
int mask = AZX_PPCTL_PROCEN(hstream->index);
- spin_lock_irq(&bus->reg_lock);
val = readw(bus->ppcap + AZX_REG_PP_PPCTL) & mask;
if (decouple && !val)
@@ -128,6 +122,20 @@ void snd_hdac_ext_stream_decouple(struct hdac_bus *bus,
snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, mask, 0);
stream->decoupled = decouple;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple_locked);
+
+/**
+ * snd_hdac_ext_stream_decouple - decouple the hdac stream
+ * @bus: HD-audio core bus
+ * @stream: HD-audio ext core stream object to initialize
+ * @decouple: flag to decouple
+ */
+void snd_hdac_ext_stream_decouple(struct hdac_bus *bus,
+ struct hdac_ext_stream *stream, bool decouple)
+{
+ spin_lock_irq(&bus->reg_lock);
+ snd_hdac_ext_stream_decouple_locked(bus, stream, decouple);
spin_unlock_irq(&bus->reg_lock);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);
@@ -252,6 +260,7 @@ hdac_ext_link_stream_assign(struct hdac_bus *bus,
return NULL;
}
+ spin_lock_irq(&bus->reg_lock);
list_for_each_entry(stream, &bus->stream_list, list) {
struct hdac_ext_stream *hstream = container_of(stream,
struct hdac_ext_stream,
@@ -266,17 +275,16 @@ hdac_ext_link_stream_assign(struct hdac_bus *bus,
}
if (!hstream->link_locked) {
- snd_hdac_ext_stream_decouple(bus, hstream, true);
+ snd_hdac_ext_stream_decouple_locked(bus, hstream, true);
res = hstream;
break;
}
}
if (res) {
- spin_lock_irq(&bus->reg_lock);
res->link_locked = 1;
res->link_substream = substream;
- spin_unlock_irq(&bus->reg_lock);
}
+ spin_unlock_irq(&bus->reg_lock);
return res;
}
@@ -292,6 +300,7 @@ hdac_ext_host_stream_assign(struct hdac_bus *bus,
return NULL;
}
+ spin_lock_irq(&bus->reg_lock);
list_for_each_entry(stream, &bus->stream_list, list) {
struct hdac_ext_stream *hstream = container_of(stream,
struct hdac_ext_stream,
@@ -301,18 +310,17 @@ hdac_ext_host_stream_assign(struct hdac_bus *bus,
if (!stream->opened) {
if (!hstream->decoupled)
- snd_hdac_ext_stream_decouple(bus, hstream, true);
+ snd_hdac_ext_stream_decouple_locked(bus, hstream, true);
res = hstream;
break;
}
}
if (res) {
- spin_lock_irq(&bus->reg_lock);
res->hstream.opened = 1;
res->hstream.running = 0;
res->hstream.substream = substream;
- spin_unlock_irq(&bus->reg_lock);
}
+ spin_unlock_irq(&bus->reg_lock);
return res;
}
@@ -378,15 +386,17 @@ void snd_hdac_ext_stream_release(struct hdac_ext_stream *stream, int type)
break;
case HDAC_EXT_STREAM_TYPE_HOST:
+ spin_lock_irq(&bus->reg_lock);
if (stream->decoupled && !stream->link_locked)
- snd_hdac_ext_stream_decouple(bus, stream, false);
+ snd_hdac_ext_stream_decouple_locked(bus, stream, false);
+ spin_unlock_irq(&bus->reg_lock);
snd_hdac_stream_release(&stream->hstream);
break;
case HDAC_EXT_STREAM_TYPE_LINK:
- if (stream->decoupled && !stream->hstream.opened)
- snd_hdac_ext_stream_decouple(bus, stream, false);
spin_lock_irq(&bus->reg_lock);
+ if (stream->decoupled && !stream->hstream.opened)
+ snd_hdac_ext_stream_decouple_locked(bus, stream, false);
stream->link_locked = 0;
stream->link_substream = NULL;
spin_unlock_irq(&bus->reg_lock);
--
2.25.1
