@@ -81,6 +81,7 @@ struct hdac_device {
atomic_t in_pm; /* suspend/resume being performed */
/* sysfs */
+ struct mutex widget_lock;
struct hdac_widget_tree *widgets;
/* regmap */
@@ -55,6 +55,7 @@ int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
codec->bus = bus;
codec->addr = addr;
codec->type = HDA_DEV_CORE;
+ mutex_init(&codec->widget_lock);
pm_runtime_set_active(&codec->dev);
pm_runtime_get_noresume(&codec->dev);
atomic_set(&codec->in_pm, 0);
@@ -141,7 +142,9 @@ int snd_hdac_device_register(struct hdac_device *codec)
err = device_add(&codec->dev);
if (err < 0)
return err;
+ mutex_lock(&codec->widget_lock);
err = hda_widget_sysfs_init(codec);
+ mutex_unlock(&codec->widget_lock);
if (err < 0) {
device_del(&codec->dev);
return err;
@@ -158,7 +161,9 @@ EXPORT_SYMBOL_GPL(snd_hdac_device_register);
void snd_hdac_device_unregister(struct hdac_device *codec)
{
if (device_is_registered(&codec->dev)) {
+ mutex_lock(&codec->widget_lock);
hda_widget_sysfs_exit(codec);
+ mutex_unlock(&codec->widget_lock);
device_del(&codec->dev);
snd_hdac_bus_remove_device(codec->bus, codec);
}
@@ -404,7 +409,9 @@ int snd_hdac_refresh_widgets(struct hdac_device *codec, bool sysfs)
}
if (sysfs) {
+ mutex_lock(&codec->widget_lock);
err = hda_widget_sysfs_reinit(codec, start_nid, nums);
+ mutex_unlock(&codec->widget_lock);
if (err < 0)
return err;
}
@@ -395,6 +395,7 @@ static int widget_tree_create(struct hdac_device *codec)
return 0;
}
+/* call with codec->widget_lock held */
int hda_widget_sysfs_init(struct hdac_device *codec)
{
int err;
@@ -411,11 +412,13 @@ int hda_widget_sysfs_init(struct hdac_device *codec)
return 0;
}
+/* call with codec->widget_lock held */
void hda_widget_sysfs_exit(struct hdac_device *codec)
{
widget_tree_free(codec);
}
+/* call with codec->widget_lock held */
int hda_widget_sysfs_reinit(struct hdac_device *codec,
hda_nid_t start_nid, int num_nodes)
{
hda_widget_sysfs_reinit() can free underlying codec->widgets structure on which widget_tree_create() operates. Add locking to prevent such issues from happening. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110382 Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> --- Changes since v1: - Moved mutexes around the callers - Added comments noting that functions should be called with mutex held --- include/sound/hdaudio.h | 1 + sound/hda/hdac_device.c | 7 +++++++ sound/hda/hdac_sysfs.c | 3 +++ 3 files changed, 11 insertions(+)