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| author | Libin Yang <libin.yang@linux.intel.com> | 2016-03-04 14:33:06 +0800 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2016-03-04 08:37:59 +0100 |
| commit | ec75a940b1037e877efd9a5a9e94eab1e464f73b (patch) | |
| tree | 10e876cc4992497a328580ab7446579e1ee01c21 /sound/pci/hda | |
| parent | 02322ac9dee9aff8d8862e8d6660ebe102f492ea (diff) | |
| download | lwn-ec75a940b1037e877efd9a5a9e94eab1e464f73b.tar.gz lwn-ec75a940b1037e877efd9a5a9e94eab1e464f73b.zip | |
ALSA: hda - hdmi add wmb barrier for audio component
To make sure audio_ptr is set before intel_audio_codec_enable()
or intel_audio_codec_disable() calling pin_eld_notify(),
this patch adds wmb barrier to prevent optimizing.
Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/hda')
| -rw-r--r-- | sound/pci/hda/patch_hdmi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 8ee78dbd4c60..6858e88c7326 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -2480,6 +2480,11 @@ static int patch_generic_hdmi(struct hda_codec *codec) if (codec_has_acomp(codec)) { codec->depop_delay = 0; spec->i915_audio_ops.audio_ptr = codec; + /* intel_audio_codec_enable() or intel_audio_codec_disable() + * will call pin_eld_notify with using audio_ptr pointer + * We need make sure audio_ptr is really setup + */ + wmb(); spec->i915_audio_ops.pin_eld_notify = intel_pin_eld_notify; snd_hdac_i915_register_notifier(&spec->i915_audio_ops); } |