[PATCH 4.2.y-ckt 41/93] ALSA: hda - Fix regression of monitor_present flag in eld proc file

[Kamal Mostafa]

4.2.8-ckt9 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Hyungwon Hwang <hyungwon.hwang7@xxxxxxxxx>

commit 023d8218ec0dfc30e11d4ec54f640e8f127d1fbe upstream.

The commit [bd48128539ab: ALSA: hda - Fix forgotten HDMI
monitor_present update] covered the missing update of monitor_present
flag, but this caused a regression for devices without the i915 eld
notifier.  Since the old code supposed that pin_eld->monitor_present
was updated by the caller side, the hdmi_present_sense_via_verbs()
doesn't update the temporary eld->monitor_present but only
pin_eld->monitor_present, which is now overridden in update_eld().

The fix is to update pin_eld->monitor_present as well before calling
update_eld().

Note that this may still leave monitor_present flag in an inconsistent
state when the driver repolls, but this is at least the old behavior.
More proper fix will follow in the later patch.

Fixes: bd48128539ab ('ALSA: hda - Fix forgotten HDMI monitor_present update')
Signed-off-by: Hyungwon Hwang <hyungwon.hwang7@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
 sound/pci/hda/patch_hdmi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 5844a76..f22e688 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1552,6 +1552,8 @@ static bool hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
 
 	mutex_lock(&per_pin->lock);
 	pin_eld->monitor_present = !!(present & AC_PINSENSE_PRESENCE);
+	eld->monitor_present = pin_eld->monitor_present;
+
 	if (pin_eld->monitor_present)
 		eld->eld_valid  = !!(present & AC_PINSENSE_ELDV);
 	else
-- 
2.7.4