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authorTakashi Iwai <tiwai@suse.de>2017-10-18 15:51:59 +0200
committerTakashi Iwai <tiwai@suse.de>2017-10-19 13:58:36 +0200
commit9780ded39bef5d22a84bdc39112df93f70a58bdd (patch)
tree312c860555df48fda2450d833a2cb1a7a7cd5b0e /include/sound/hdaudio.h
parent28d1d6d2f314ff395ff67565d1145742614b21c8 (diff)
downloadlinux-9780ded39bef5d22a84bdc39112df93f70a58bdd.tar.bz2
ALSA: hda: Avoid racy recreation of widget kobjects
The refresh of HD-audio widget sysfs kobjects via snd_hdac_refresh_widget_sysfs() is slightly racy. The driver recreates the whole tree from scratch after deleting the whole. When CONFIG_DEBUG_KOBJECT_RELEASE option is used, kobject release doesn't happen immediately but delayed, while the re-creation of the same named kobject happens soon after invoking kobject_put(). This may end up with the conflicts of duplicated kobjects, as found in the bug report below. In this patch, we take another approach to refresh the tree: instead of recreating the whole tree, just add the new nodes and delete the non-existing nodes. Since the refresh happens only once at initialization, no longer race would happen. Along with the code change, merge snd_hdac_refresh_widget_sysfs() with the existing snd_hdac_refresh_widgets() with an additional bool flag for simplifying the code. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=197307 Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/hdaudio.h')
-rw-r--r--include/sound/hdaudio.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index 96546b30e900..6f1118545bb8 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -111,8 +111,7 @@ void snd_hdac_device_unregister(struct hdac_device *codec);
int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name);
int snd_hdac_codec_modalias(struct hdac_device *hdac, char *buf, size_t size);
-int snd_hdac_refresh_widgets(struct hdac_device *codec);
-int snd_hdac_refresh_widget_sysfs(struct hdac_device *codec);
+int snd_hdac_refresh_widgets(struct hdac_device *codec, bool sysfs);
unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
unsigned int verb, unsigned int parm);