ALSA: hda - Protect user-defined arrays via mutex
The pincfgs, init_verbs and hints set by sysfs or patch might be
changed dynamically on the fly, thus we need to protect it.
Add a simple protection via a mutex.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 0a531f2..b28e403 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1086,9 +1086,16 @@
struct hda_pincfg *pin;
#ifdef CONFIG_SND_HDA_HWDEP
- pin = look_up_pincfg(codec, &codec->user_pins, nid);
- if (pin)
- return pin->cfg;
+ {
+ unsigned int cfg = 0;
+ mutex_lock(&codec->user_mutex);
+ pin = look_up_pincfg(codec, &codec->user_pins, nid);
+ if (pin)
+ cfg = pin->cfg;
+ mutex_unlock(&codec->user_mutex);
+ if (cfg)
+ return cfg;
+ }
#endif
pin = look_up_pincfg(codec, &codec->driver_pins, nid);
if (pin)