ASoC: omap-abe-twl6040: Correct dmic-codec device registration

The dmic-codec was registered within the platform_driver's probe function,
which can cause deferred probe to run in loops as reported and analyzed by
Russell King.

Use module_init/exit in the driver and handle the dmic-codec device
registration and removal at that level instead of the platform_driver
probe/remove.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reported-by: Russell King <rmk+kernel@armlinux.org.uk>
Tested-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 32 insertions, 29 deletions

diff --git a/sound/soc/omap/omap-abe-twl6040.c b/sound/soc/omap/omap-abe-twl6040.c
index 0843a68f277c..f61b3b58083b 100644
--- a/sound/soc/omap/omap-abe-twl6040.c
+++ b/sound/soc/omap/omap-abe-twl6040.c
@@ -38,10 +38,10 @@
 struct abe_twl6040 {
         int     jack_detection; /* board can detect jack events */
         int     mclk_freq;      /* MCLK frequency speed for twl6040 */
-
-        struct platform_device *dmic_codec_dev;
 };
 
+struct platform_device *dmic_codec_dev;
+
 static int omap_abe_hw_params(struct snd_pcm_substream *substream,
         struct snd_pcm_hw_params *params)
 {
@@ -258,8 +258,6 @@ static int omap_abe_probe(struct platform_device *pdev)
         if (priv == NULL)
                 return -ENOMEM;
 
-        priv->dmic_codec_dev = ERR_PTR(-EINVAL);
-
         if (snd_soc_of_parse_card_name(card, "ti,model")) {
                 dev_err(&pdev->dev, "Card name is not provided\n");
                 return -ENODEV;
@@ -284,13 +282,6 @@ static int omap_abe_probe(struct platform_device *pdev)
                 num_links = 2;
                 abe_twl6040_dai_links[1].cpu_of_node = dai_node;
                 abe_twl6040_dai_links[1].platform_of_node = dai_node;
-
-                priv->dmic_codec_dev = platform_device_register_simple(
-                                                "dmic-codec", -1, NULL, 0);
-                if (IS_ERR(priv->dmic_codec_dev)) {
-                        dev_err(&pdev->dev, "Can't instantiate dmic-codec\n");
-                        return PTR_ERR(priv->dmic_codec_dev);
-                }
         } else {
                 num_links = 1;
         }
@@ -299,16 +290,14 @@ static int omap_abe_probe(struct platform_device *pdev)
         of_property_read_u32(node, "ti,mclk-freq", &priv->mclk_freq);
         if (!priv->mclk_freq) {
                 dev_err(&pdev->dev, "MCLK frequency not provided\n");
-                ret = -EINVAL;
-                goto err_unregister;
+                return -EINVAL;
         }
 
         card->fully_routed = 1;
 
         if (!priv->mclk_freq) {
                 dev_err(&pdev->dev, "MCLK frequency missing\n");
-                ret = -ENODEV;
-                goto err_unregister;
+                return -ENODEV;
         }
 
         card->dai_link = abe_twl6040_dai_links;
@@ -317,17 +306,9 @@ static int omap_abe_probe(struct platform_device *pdev)
         snd_soc_card_set_drvdata(card, priv);
 
         ret = snd_soc_register_card(card);
-        if (ret) {
+        if (ret)
                 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
                         ret);
-                goto err_unregister;
-        }
-
-        return 0;
-
-err_unregister:
-        if (!IS_ERR(priv->dmic_codec_dev))
-                platform_device_unregister(priv->dmic_codec_dev);
 
         return ret;
 }
@@ -335,13 +316,9 @@ err_unregister:
 static int omap_abe_remove(struct platform_device *pdev)
 {
         struct snd_soc_card *card = platform_get_drvdata(pdev);
-        struct abe_twl6040 *priv = snd_soc_card_get_drvdata(card);
 
         snd_soc_unregister_card(card);
 
-        if (!IS_ERR(priv->dmic_codec_dev))
-                platform_device_unregister(priv->dmic_codec_dev);
-
         return 0;
 }
 
@@ -361,7 +338,33 @@ static struct platform_driver omap_abe_driver = {
         .remove = omap_abe_remove,
 };
 
-module_platform_driver(omap_abe_driver);
+static int __init omap_abe_init(void)
+{
+        int ret;
+
+        dmic_codec_dev = platform_device_register_simple("dmic-codec", -1, NULL,
+                                                         0);
+        if (IS_ERR(dmic_codec_dev)) {
+                pr_err("%s: dmic-codec device registration failed\n", __func__);
+                return PTR_ERR(dmic_codec_dev);
+        }
+
+        ret = platform_driver_register(&omap_abe_driver);
+        if (ret) {
+                pr_err("%s: platform driver registration failed\n", __func__);
+                platform_device_unregister(dmic_codec_dev);
+        }
+
+        return ret;
+}
+module_init(omap_abe_init);
+
+static void __exit omap_abe_exit(void)
+{
+        platform_driver_unregister(&omap_abe_driver);
+        platform_device_unregister(dmic_codec_dev);
+}
+module_exit(omap_abe_exit);
 
 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
 MODULE_DESCRIPTION("ALSA SoC for OMAP boards with ABE and twl6040 codec");