ALSA: hda - Make snd_hda_jack_detect_enable_callback() returning the jack object

STAC/IDT driver calls snd_hda_jack_tbl_get() again after calling
snd_hda_jack_detect_enable_callback().  For simplifying this, let's
make snd_hda_jack_detect_enable_callback() returning the pointer while
handling the error with the standard IS_ERR() & co.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_jack.c

@@ -214,29 +214,39 @@ EXPORT_SYMBOL_GPL(snd_hda_jack_detect_state);
 
 /**
  * snd_hda_jack_detect_enable - enable the jack-detection
+ *
+ * In the case of error, the return value will be a pointer embedded with
+ * errno.  Check and handle the return value appropriately with standard
+ * macros such as @IS_ERR() and @PTR_ERR().
  */
-int snd_hda_jack_detect_enable_callback(struct hda_codec *codec, hda_nid_t nid,
+struct hda_jack_tbl *
+snd_hda_jack_detect_enable_callback(struct hda_codec *codec, hda_nid_t nid,
 				    hda_jack_callback cb)
 {
 	struct hda_jack_tbl *jack = snd_hda_jack_tbl_new(codec, nid);
+	int err;
+
 	if (!jack)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 	if (jack->jack_detect)
-		return 0; /* already registered */
+		return jack; /* already registered */
 	jack->jack_detect = 1;
 	if (cb)
 		jack->callback = cb;
 	if (codec->jackpoll_interval > 0)
-		return 0; /* No unsol if we're polling instead */
-	return snd_hda_codec_write_cache(codec, nid, 0,
+		return jack; /* No unsol if we're polling instead */
+	err = snd_hda_codec_write_cache(codec, nid, 0,
 					 AC_VERB_SET_UNSOLICITED_ENABLE,
 					 AC_USRSP_EN | jack->tag);
+	if (err < 0)
+		return ERR_PTR(err);
+	return jack;
 }
 EXPORT_SYMBOL_GPL(snd_hda_jack_detect_enable_callback);
 
 int snd_hda_jack_detect_enable(struct hda_codec *codec, hda_nid_t nid)
 {
-	return snd_hda_jack_detect_enable_callback(codec, nid, NULL);
+	return PTR_ERR_OR_ZERO(snd_hda_jack_detect_enable_callback(codec, nid, NULL));
 }
 EXPORT_SYMBOL_GPL(snd_hda_jack_detect_enable);
 

sound/pci/hda/hda_jack.h

@@ -47,7 +47,8 @@ void snd_hda_jack_tbl_clear(struct hda_codec *codec);
 void snd_hda_jack_set_dirty_all(struct hda_codec *codec);
 
 int snd_hda_jack_detect_enable(struct hda_codec *codec, hda_nid_t nid);
-int snd_hda_jack_detect_enable_callback(struct hda_codec *codec, hda_nid_t nid,
+struct hda_jack_tbl *
+snd_hda_jack_detect_enable_callback(struct hda_codec *codec, hda_nid_t nid,
 				    hda_jack_callback cb);
 
 int snd_hda_jack_set_gating_jack(struct hda_codec *codec, hda_nid_t gated_nid,

sound/pci/hda/patch_sigmatel.c

@@ -3019,10 +3019,9 @@ static void stac92hd71bxx_fixup_hp_m4(struct hda_codec *codec,
 	/* Enable VREF power saving on GPIO1 detect */
 	snd_hda_codec_write_cache(codec, codec->afg, 0,
 				  AC_VERB_SET_GPIO_UNSOLICITED_RSP_MASK, 0x02);
-	snd_hda_jack_detect_enable_callback(codec, codec->afg,
+	jack = snd_hda_jack_detect_enable_callback(codec, codec->afg,
 						   stac_vref_event);
-	jack = snd_hda_jack_tbl_get(codec, codec->afg);
-	if (jack)
+	if (!IS_ERR(jack))
 		jack->private_data = 0x02;
 
 	spec->gpio_mask |= 0x02;
@@ -4042,10 +4041,9 @@ static void stac9205_fixup_dell_m43(struct hda_codec *codec,
 		/* Enable unsol response for GPIO4/Dock HP connection */
 		snd_hda_codec_write_cache(codec, codec->afg, 0,
 			AC_VERB_SET_GPIO_UNSOLICITED_RSP_MASK, 0x10);
-		snd_hda_jack_detect_enable_callback(codec, codec->afg,
+		jack = snd_hda_jack_detect_enable_callback(codec, codec->afg,
 							   stac_vref_event);
-		jack = snd_hda_jack_tbl_get(codec, codec->afg);
-		if (jack)
+		if (!IS_ERR(jack))
 			jack->private_data = 0x01;
 
 		spec->gpio_dir = 0x0b;