From 302d5a80d232134246032bc4263fd7facdddb8f1 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 29 Oct 2019 21:41:20 +0100 Subject: ALSA: hda - Fix mutex deadlock in HDMI codec driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Link: https://lore.kernel.org/r/s5himo7i89i.wl-tiwai@suse.de Signed-off-by: Takashi Iwai --- sound/pci/hda/patch_hdmi.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'sound') 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 */ -- cgit