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authorTakashi Iwai <tiwai@suse.de>2019-10-29 21:41:20 +0100
committerTakashi Iwai <tiwai@suse.de>2019-10-30 15:32:37 +0100
commit302d5a80d232134246032bc4263fd7facdddb8f1 (patch)
treeb36a354c7572ab6773c0f19c968044af9955eed6 /sound
parent1a7f60b9df614bb36d14dc0c0bc898a31b2b506f (diff)
downloadlinux-302d5a80d232134246032bc4263fd7facdddb8f1.tar.bz2
ALSA: hda - Fix mutex deadlock in HDMI codec driver
The commit ade49db337a9 ("ALSA: hda/hdmi - Allow audio component for AMD/ATI and Nvidia HDMI") introduced the spec->pcm_lock mutex lock to the whole generic_hdmi_init() function for avoiding the race with the audio component registration. However, this caused a dead lock when the unsolicited event is handled without the audio component, as the codec gets runtime-resumed in hdmi_present_sense() which is already inside the spec->pcm_lock in its caller. For avoiding this deadlock, add a new mutex only for the audio component binding that is used in both generic_hdmi_init() and the audio notifier registration where the jack callbacks are handled / re-registered. Fixes: ade49db337a9 ("ALSA: hda/hdmi - Allow audio component for AMD/ATI and Nvidia HDMI") Reported-and-tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://lore.kernel.org/r/s5himo7i89i.wl-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/patch_hdmi.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 795cbda32cbb..b72553710ffb 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -145,6 +145,7 @@ struct hdmi_spec {
struct snd_array pins; /* struct hdmi_spec_per_pin */
struct hdmi_pcm pcm_rec[16];
struct mutex pcm_lock;
+ struct mutex bind_lock; /* for audio component binding */
/* pcm_bitmap means which pcms have been assigned to pins*/
unsigned long pcm_bitmap;
int pcm_used; /* counter of pcm_rec[] */
@@ -2258,7 +2259,7 @@ static int generic_hdmi_init(struct hda_codec *codec)
struct hdmi_spec *spec = codec->spec;
int pin_idx;
- mutex_lock(&spec->pcm_lock);
+ mutex_lock(&spec->bind_lock);
spec->use_jack_detect = !codec->jackpoll_interval;
for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
@@ -2275,7 +2276,7 @@ static int generic_hdmi_init(struct hda_codec *codec)
snd_hda_jack_detect_enable_callback(codec, pin_nid,
jack_callback);
}
- mutex_unlock(&spec->pcm_lock);
+ mutex_unlock(&spec->bind_lock);
return 0;
}
@@ -2382,6 +2383,7 @@ static int alloc_generic_hdmi(struct hda_codec *codec)
spec->ops = generic_standard_hdmi_ops;
spec->dev_num = 1; /* initialize to 1 */
mutex_init(&spec->pcm_lock);
+ mutex_init(&spec->bind_lock);
snd_hdac_register_chmap_ops(&codec->core, &spec->chmap);
spec->chmap.ops.get_chmap = hdmi_get_chmap;
@@ -2451,7 +2453,7 @@ static void generic_acomp_notifier_set(struct drm_audio_component *acomp,
int i;
spec = container_of(acomp->audio_ops, struct hdmi_spec, drm_audio_ops);
- mutex_lock(&spec->pcm_lock);
+ mutex_lock(&spec->bind_lock);
spec->use_acomp_notifier = use_acomp;
spec->codec->relaxed_resume = use_acomp;
/* reprogram each jack detection logic depending on the notifier */
@@ -2461,7 +2463,7 @@ static void generic_acomp_notifier_set(struct drm_audio_component *acomp,
get_pin(spec, i)->pin_nid,
use_acomp);
}
- mutex_unlock(&spec->pcm_lock);
+ mutex_unlock(&spec->bind_lock);
}
/* enable / disable the notifier via master bind / unbind */