ASoC: don't register AC97 devices twice

With generic AC97 ASoC glue driver (codec/ac97.c), we get following warning when
the device is registered (slightly stripped the backtrace):

kobject (c5a863e8): tried to init an initialized object, something is seriously
                    wrong.
[<c00254fc>] (unwind_backtrace+0x0/0xec)
[<c014fad0>] (kobject_init+0x38/0x70)
[<c0171e94>] (device_initialize+0x20/0x70)
[<c017267c>] (device_register+0xc/0x18)
[<bf20db70>] (snd_soc_instantiate_cards+0x924/0xacc [snd_soc_core])
[<bf20e0d0>] (snd_soc_register_platform+0x16c/0x198 [snd_soc_core])
[<c0175304>] (platform_drv_probe+0x18/0x1c)
[<c0174454>] (driver_probe_device+0xb0/0x16c)
[<c017456c>] (__driver_attach+0x5c/0x7c)
[<c0173cec>] (bus_for_each_dev+0x48/0x78)
[<c0173600>] (bus_add_driver+0x98/0x214)
[<c0174834>] (driver_register+0xa4/0x130)
[<c001f410>] (do_one_initcall+0xd0/0x1a4)
[<c0062ddc>] (sys_init_module+0x12b0/0x1454)

This happens because the generic AC97 glue driver creates its codec->ac97 via
calling snd_ac97_mixer(). snd_ac97_mixer() provides own version of
snd_device.register which handles the device registration when
snd_card_register() is called.

To avoid registering the AC97 device twice, we add a new flag to the
snd_soc_codec: ac97_created which tells whether the AC97 device was created by
SoC subsystem.

Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 4fb079e14e1..5c3bce83f28 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -442,6 +442,7 @@ struct snd_soc_codec {
         unsigned int suspended:1; /* Codec is in suspend PM state */
         unsigned int probed:1; /* Codec has been probed */
         unsigned int ac97_registered:1; /* Codec has been AC97 registered */
+        unsigned int ac97_created:1; /* Codec has been created by SoC */
         unsigned int sysfs_registered:1; /* codec has been sysfs registered */
 
         /* codec IO */
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 8751efdea11..7d22b5d5bc0 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1497,6 +1497,16 @@ static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
          * for the generic AC97 subsystem.
          */
         if (rtd->codec_dai->driver->ac97_control && !rtd->codec->ac97_registered) {
+                /*
+                 * It is possible that the AC97 device is already registered to
+                 * the device subsystem. This happens when the device is created
+                 * via snd_ac97_mixer(). Currently only SoC codec that does so
+                 * is the generic AC97 glue but others migh emerge.
+                 *
+                 * In those cases we don't try to register the device again.
+                 */
+                if (!rtd->codec->ac97_created)
+                        return 0;
 
                 ret = soc_ac97_dev_register(rtd->codec);
                 if (ret < 0) {
@@ -1812,6 +1822,13 @@ int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
 
         codec->ac97->bus->ops = ops;
         codec->ac97->num = num;
+
+        /*
+         * Mark the AC97 device to be created by us. This way we ensure that the
+         * device will be registered with the device subsystem later on.
+         */
+        codec->ac97_created = 1;
+
         mutex_unlock(&codec->mutex);
         return 0;
 }
@@ -1832,6 +1849,7 @@ void snd_soc_free_ac97_codec(struct snd_soc_codec *codec)
         kfree(codec->ac97->bus);
         kfree(codec->ac97);
         codec->ac97 = NULL;
+        codec->ac97_created = 0;
         mutex_unlock(&codec->mutex);
 }
 EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec);