From 0562f7882d968463119bb63d47ef4bdaba7d6631 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Wed, 13 Oct 2010 11:30:32 +0300 Subject: [PATCH] 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. [] (unwind_backtrace+0x0/0xec) [] (kobject_init+0x38/0x70) [] (device_initialize+0x20/0x70) [] (device_register+0xc/0x18) [] (snd_soc_instantiate_cards+0x924/0xacc [snd_soc_core]) [] (snd_soc_register_platform+0x16c/0x198 [snd_soc_core]) [] (platform_drv_probe+0x18/0x1c) [] (driver_probe_device+0xb0/0x16c) [] (__driver_attach+0x5c/0x7c) [] (bus_for_each_dev+0x48/0x78) [] (bus_add_driver+0x98/0x214) [] (driver_register+0xa4/0x130) [] (do_one_initcall+0xd0/0x1a4) [] (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 Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- include/sound/soc.h | 1 + sound/soc/soc-core.c | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/sound/soc.h b/include/sound/soc.h index 4fb079e..5c3bce8 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 8751efd..7d22b5d 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); -- 2.7.4