linux-kernel - [PATCH 6.0 396/862] ALSA: hda/hdmi: Fix the converter allocation for the silent stream

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Date:   Wed, 19 Oct 2022 10:28:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 396/862] ALSA: hda/hdmi: Fix the converter allocation for the silent stream

From: Jaroslav Kysela <perex@...ex.cz>

[ Upstream commit fc6f923ecfa2fafd0600f1b7e2de09baf29865e2 ]

Track the converters handling the silent stream using a new
variable to avoid mixing of the open/close and silent stream
use. This change ensures the proper allocation of the converters.

Fixes: 5f80d6bd2b01 ("ALSA: hda/hdmi: Fix the converter reuse for the silent stream")

Signed-off-by: Jaroslav Kysela <perex@...ex.cz>
Reviewed-by: Kai Vehmanen <kai.vehmanen@...ux.intel.com>
Link: https://lore.kernel.org/r/20220919135444.3554982-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/pci/hda/patch_hdmi.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 69afea67bf3e..d463c968b3a4 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -54,6 +54,7 @@ MODULE_PARM_DESC(enable_all_pins, "Forcibly enable all pins");
 struct hdmi_spec_per_cvt {
 	hda_nid_t cvt_nid;
 	bool assigned;		/* the stream has been assigned */
+	bool silent_stream;	/* silent stream activated */
 	unsigned int channels_min;
 	unsigned int channels_max;
 	u32 rates;
@@ -988,7 +989,8 @@ static int hdmi_setup_stream(struct hda_codec *codec, hda_nid_t cvt_nid,
  * of the pin.
  */
 static int hdmi_choose_cvt(struct hda_codec *codec,
-			   int pin_idx, int *cvt_id)
+			   int pin_idx, int *cvt_id,
+			   bool silent)
 {
 	struct hdmi_spec *spec = codec->spec;
 	struct hdmi_spec_per_pin *per_pin;
@@ -1003,6 +1005,9 @@ static int hdmi_choose_cvt(struct hda_codec *codec,
 
 	if (per_pin && per_pin->silent_stream) {
 		cvt_idx = cvt_nid_to_cvt_index(codec, per_pin->cvt_nid);
+		per_cvt = get_cvt(spec, cvt_idx);
+		if (per_cvt->assigned && !silent)
+			return -EBUSY;
 		if (cvt_id)
 			*cvt_id = cvt_idx;
 		return 0;
@@ -1013,7 +1018,7 @@ static int hdmi_choose_cvt(struct hda_codec *codec,
 		per_cvt = get_cvt(spec, cvt_idx);
 
 		/* Must not already be assigned */
-		if (per_cvt->assigned)
+		if (per_cvt->assigned || per_cvt->silent_stream)
 			continue;
 		if (per_pin == NULL)
 			break;
@@ -1199,7 +1204,7 @@ static int hdmi_pcm_open_no_pin(struct hda_pcm_stream *hinfo,
 	if (pcm_idx < 0)
 		return -EINVAL;
 
-	err = hdmi_choose_cvt(codec, -1, &cvt_idx);
+	err = hdmi_choose_cvt(codec, -1, &cvt_idx, false);
 	if (err)
 		return err;
 
@@ -1267,7 +1272,7 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
 		}
 	}
 
-	err = hdmi_choose_cvt(codec, pin_idx, &cvt_idx);
+	err = hdmi_choose_cvt(codec, pin_idx, &cvt_idx, false);
 	if (err < 0)
 		goto unlock;
 
@@ -1278,7 +1283,6 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
 	set_bit(pcm_idx, &spec->pcm_in_use);
 	per_pin = get_pin(spec, pin_idx);
 	per_pin->cvt_nid = per_cvt->cvt_nid;
-	per_pin->silent_stream = false;
 	hinfo->nid = per_cvt->cvt_nid;
 
 	/* flip stripe flag for the assigned stream if supported */
@@ -1760,14 +1764,14 @@ static void silent_stream_enable(struct hda_codec *codec,
 	}
 
 	pin_idx = pin_id_to_pin_index(codec, per_pin->pin_nid, per_pin->dev_id);
-	err = hdmi_choose_cvt(codec, pin_idx, &cvt_idx);
+	err = hdmi_choose_cvt(codec, pin_idx, &cvt_idx, true);
 	if (err) {
 		codec_err(codec, "hdmi: no free converter to enable silent mode\n");
 		goto unlock_out;
 	}
 
 	per_cvt = get_cvt(spec, cvt_idx);
-	per_cvt->assigned = true;
+	per_cvt->silent_stream = true;
 	per_pin->cvt_nid = per_cvt->cvt_nid;
 	per_pin->silent_stream = true;
 
@@ -1827,7 +1831,7 @@ static void silent_stream_disable(struct hda_codec *codec,
 	cvt_idx = cvt_nid_to_cvt_index(codec, per_pin->cvt_nid);
 	if (cvt_idx >= 0 && cvt_idx < spec->num_cvts) {
 		per_cvt = get_cvt(spec, cvt_idx);
-		per_cvt->assigned = false;
+		per_cvt->silent_stream = false;
 	}
 
 	if (spec->silent_stream_type == SILENT_STREAM_I915) {
-- 
2.35.1