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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>
This commit is contained in:
Libin Yang 2016-03-04 14:33:06 +08:00 committed by Takashi Iwai
parent 02322ac9de
commit ec75a940b1
1 changed files with 5 additions and 0 deletions
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5
sound/pci/hda/patch_hdmi.c
View File

@ -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);
}