From: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com
[ Upstream commit ed180abba7f1fc3cf04ffa27767b1bcc8e8c842a ]
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 Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- include/sound/hdaudio.h | 1 + sound/hda/hdac_device.c | 7 +++++++ sound/hda/hdac_sysfs.c | 3 +++ 3 files changed, 11 insertions(+)
diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h index cd1773d0e08f0..0c68783be26fc 100644 --- a/include/sound/hdaudio.h +++ b/include/sound/hdaudio.h @@ -82,6 +82,7 @@ struct hdac_device { bool link_power_control:1;
/* sysfs */ + struct mutex widget_lock; struct hdac_widget_tree *widgets;
/* regmap */ diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c index dbf02a3a8d2f2..020fbbbcf6f5c 100644 --- a/sound/hda/hdac_device.c +++ b/sound/hda/hdac_device.c @@ -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; } diff --git a/sound/hda/hdac_sysfs.c b/sound/hda/hdac_sysfs.c index fb2aa344981e6..909d5ef1179c9 100644 --- a/sound/hda/hdac_sysfs.c +++ b/sound/hda/hdac_sysfs.c @@ -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) {