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ASoC: hdac_hda: fix memleak on module unload 

The hdac_hda remove implementation fails to free the hda codec
resources, leading to memleaks at module unload. This gap has been there
from the start, commit 6bae5ea949 ("ASoC: hdac_hda: add asoc
extension for legacy HDA codec drivers").

Instead of duplicating the cleanup logic, use the common
snd_hda_codec_cleanup_for_unbind() to free the resources. Remove
existing code in hdac_hda to cleanup "codec.jackpoll_work" and call to
snd_hdac_regmap_exit(), as these are already done in
snd_hda_codec_cleanup_for_unbind().

The cleanup is done in ASoC component remove() callback and not in the
HDAC bus hdev_detach(). This is done to ensure the codec specific
cleanup routines are run before the parent card is freed.

Fixes: 6bae5ea949 ("ASoC: hdac_hda: add asoc extension for legacy HDA codec drivers")
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
BugLink: https://github.com/thesofproject/linux/issues/2195
Link: https://lore.kernel.org/r/20200717101950.3885187-2-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kai Vehmanen 2020-07-17 13:19:49 +03:00 committed by Mark Brown
parent 640f835cd0
commit c3ec8ac821
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 9 additions and 7 deletions
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16
sound/soc/codecs/hdac_hda.c
View File

@ -513,6 +513,7 @@ static void hdac_hda_codec_remove(struct snd_soc_component *component)
struct hdac_hda_priv *hda_pvt =
snd_soc_component_get_drvdata(component);
struct hdac_device *hdev = &hda_pvt->codec.core;
struct hda_codec *codec = &hda_pvt->codec;
struct hdac_ext_link *hlink = NULL;
hlink = snd_hdac_ext_bus_get_link(hdev->bus, dev_name(&hdev->dev));
@ -524,7 +525,10 @@ static void hdac_hda_codec_remove(struct snd_soc_component *component)
pm_runtime_disable(&hdev->dev);
snd_hdac_ext_bus_link_put(hdev->bus, hlink);
snd_hdac_regmap_exit(hdev);
if (codec->patch_ops.free)
codec->patch_ops.free(codec);
snd_hda_codec_cleanup_for_unbind(codec);
}
static const struct snd_soc_dapm_route hdac_hda_dapm_routes[] = {
@ -608,12 +612,10 @@ static int hdac_hda_dev_probe(struct hdac_device *hdev)
static int hdac_hda_dev_remove(struct hdac_device *hdev)
{
struct hdac_hda_priv *hda_pvt;
hda_pvt = dev_get_drvdata(&hdev->dev);
if (hda_pvt && hda_pvt->codec.registered)
cancel_delayed_work_sync(&hda_pvt->codec.jackpoll_work);
/*
* Resources are freed in hdac_hda_codec_remove(). This
* function is kept to keep hda_codec_driver_remove() happy.
*/
return 0;
}