ALSA: hda - Fix inconsistent input_paths after ADC reduction

In the current parser code, the input_paths[] may become inconsistent
when some of detected ADCs are dropped due to incomplete inputs, since
the driver rearranges only adc_nids[] but doesn't touch input_paths[].

This patch fixes the issue, and also it optimizes the reachability
checks by simply referring to the parsed input_paths[] instead of
calling is_reachable() again for each connection.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_generic.c

@@ -2002,24 +2002,24 @@ static int check_dyn_adc_switch(struct hda_codec *codec)
 {
 	struct hda_gen_spec *spec = codec->spec;
 	struct hda_input_mux *imux = &spec->input_mux;
-	hda_nid_t adc_nids[ARRAY_SIZE(spec->adc_nids)];
+	unsigned int ok_bits;
 	int i, n, nums;
-	hda_nid_t pin, adc;
 
  again:
 	nums = 0;
+	ok_bits = 0;
 	for (n = 0; n < spec->num_adc_nids; n++) {
-		adc = spec->adc_nids[n];
 		for (i = 0; i < imux->num_items; i++) {
-			pin = spec->imux_pins[i];
-			if (!is_reachable_path(codec, pin, adc))
+			if (!spec->input_paths[i][n])
 				break;
 		}
-		if (i >= imux->num_items)
-			adc_nids[nums++] = adc;
+		if (i >= imux->num_items) {
+			ok_bits |= (1 << n);
+			nums++;
+		}
 	}
 
-	if (!nums) {
+	if (!ok_bits) {
 		if (spec->shared_mic_hp) {
 			spec->shared_mic_hp = 0;
 			imux->num_items = 1;
@@ -2028,10 +2028,8 @@ static int check_dyn_adc_switch(struct hda_codec *codec)
 
 		/* check whether ADC-switch is possible */
 		for (i = 0; i < imux->num_items; i++) {
-			pin = spec->imux_pins[i];
 			for (n = 0; n < spec->num_adc_nids; n++) {
-				adc = spec->adc_nids[n];
-				if (is_reachable_path(codec, pin, adc)) {
+				if (spec->input_paths[i][n]) {
 					spec->dyn_adc_idx[i] = n;
 					break;
 				}
@@ -2041,7 +2039,19 @@ static int check_dyn_adc_switch(struct hda_codec *codec)
 		snd_printdd("hda-codec: enabling ADC switching\n");
 		spec->dyn_adc_switch = 1;
 	} else if (nums != spec->num_adc_nids) {
-		memcpy(spec->adc_nids, adc_nids, nums * sizeof(hda_nid_t));
+		/* shrink the invalid adcs and input paths */
+		nums = 0;
+		for (n = 0; n < spec->num_adc_nids; n++) {
+			if (!(ok_bits & (1 << n)))
+				continue;
+			if (n != nums) {
+				spec->adc_nids[nums] = spec->adc_nids[n];
+				for (i = 0; i < imux->num_items; i++)
+					spec->input_paths[i][nums] =
+						spec->input_paths[i][n];
+			}
+			nums++;
+		}
 		spec->num_adc_nids = nums;
 	}