ALSA: hda - Check the existing path in snd_hda_add_new_path()

If the requested path has been already added, return the existing path
instance instead of adding a duplicated instance.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index ee2c973..f9ecbe0 100644 (file)
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -116,11 +116,9 @@ EXPORT_SYMBOL_HDA(snd_hda_gen_spec_free);
  * parsing paths
  */
 
-/* get the path between the given NIDs;
- * passing 0 to either @pin or @dac behaves as a wildcard
- */
-struct nid_path *snd_hda_get_nid_path(struct hda_codec *codec,
-                                     hda_nid_t from_nid, hda_nid_t to_nid)
+static struct nid_path *get_nid_path(struct hda_codec *codec,
+                                    hda_nid_t from_nid, hda_nid_t to_nid,
+                                    int with_aa_mix)
 {
        struct hda_gen_spec *spec = codec->spec;
        int i;
@@ -130,11 +128,23 @@ struct nid_path *snd_hda_get_nid_path(struct hda_codec *codec,
                if (path->depth <= 0)
                        continue;
                if ((!from_nid || path->path[0] == from_nid) &&
-                   (!to_nid || path->path[path->depth - 1] == to_nid))
-                       return path;
+                   (!to_nid || path->path[path->depth - 1] == to_nid)) {
+                       if (with_aa_mix == HDA_PARSE_ALL ||
+                           path->with_aa_mix == with_aa_mix)
+                               return path;
+               }
        }
        return NULL;
 }
+
+/* get the path between the given NIDs;
+ * passing 0 to either @pin or @dac behaves as a wildcard
+ */
+struct nid_path *snd_hda_get_nid_path(struct hda_codec *codec,
+                                     hda_nid_t from_nid, hda_nid_t to_nid)
+{
+       return get_nid_path(codec, from_nid, to_nid, HDA_PARSE_ALL);
+}
 EXPORT_SYMBOL_HDA(snd_hda_get_nid_path);
 
 /* check whether the given DAC is already found in any existing paths */
@@ -248,6 +258,8 @@ static bool __parse_nid_path(struct hda_codec *codec,
 
  found:
        path->path[path->depth] = conn[i];
+       if (conn[i] == spec->mixer_nid)
+               path->with_aa_mix = true;
        path->idx[path->depth + 1] = i;
        if (nums > 1 && get_wcaps_type(get_wcaps(codec, to_nid)) != AC_WID_AUD_MIX)
                path->multi[path->depth + 1] = 1;
@@ -290,6 +302,11 @@ snd_hda_add_new_path(struct hda_codec *codec, hda_nid_t from_nid,
        if (from_nid && to_nid && !is_reachable_path(codec, from_nid, to_nid))
                return NULL;
 
+       /* check whether the path has been already added */
+       path = get_nid_path(codec, from_nid, to_nid, with_aa_mix);
+       if (path)
+               return path;
+
        path = snd_array_new(&spec->paths);
        if (!path)
                return NULL;

diff --git a/sound/pci/hda/hda_generic.h b/sound/pci/hda/hda_generic.h
index 1090a52..f1cae2e 100644 (file)
--- a/sound/pci/hda/hda_generic.h
+++ b/sound/pci/hda/hda_generic.h
@@ -53,6 +53,7 @@ struct nid_path {
        unsigned char multi[MAX_NID_PATH_DEPTH];
        unsigned int ctls[NID_PATH_NUM_CTLS]; /* NID_PATH_XXX_CTL */
        bool active;
+       bool with_aa_mix;
 };
 
 /* mic/line-in auto switching entry */