forked from Minki/linux
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>
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@ -2480,6 +2480,11 @@ static int patch_generic_hdmi(struct hda_codec *codec)
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if (codec_has_acomp(codec)) {
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codec->depop_delay = 0;
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spec->i915_audio_ops.audio_ptr = codec;
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/* intel_audio_codec_enable() or intel_audio_codec_disable()
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* will call pin_eld_notify with using audio_ptr pointer
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* We need make sure audio_ptr is really setup
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*/
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wmb();
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spec->i915_audio_ops.pin_eld_notify = intel_pin_eld_notify;
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snd_hdac_i915_register_notifier(&spec->i915_audio_ops);
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}
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