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ASoC: Don't try to register debugfs entries if the parent does not exist

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If the registration of a debugfs directory fails this is treated as a
non-fatal error in ASoC and operation continues as normal. This means we
need to be careful and check if the parent debugfs directory exists if we
try to register a debugfs file or sub-directory. Otherwise we might end up
passing NULL for the parent and the file or directory will be registered in
the top-level debugfs directory.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2015-04-09 10:52:38 +02:00 committed by Mark Brown
parent 2e55b90a5e
commit 6553bf06a3
3 changed files with 54 additions and 23 deletions
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66
sound/soc/soc-core.c
View File

@ -292,6 +292,9 @@ static const struct file_operations codec_reg_fops = {
static void soc_init_component_debugfs(struct snd_soc_component *component)
{
if (!component->card->debugfs_card_root)
return;
if (component->debugfs_prefix) {
char *name;
@ -455,6 +458,9 @@ static const struct file_operations platform_list_fops = {
static void soc_init_card_debugfs(struct snd_soc_card *card)
{
if (!snd_soc_debugfs_root)
return;
card->debugfs_card_root = debugfs_create_dir(card->name,
snd_soc_debugfs_root);
if (!card->debugfs_card_root) {
@ -476,6 +482,34 @@ static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
debugfs_remove_recursive(card->debugfs_card_root);
}
static void snd_soc_debugfs_init(void)
{
snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);
if (IS_ERR(snd_soc_debugfs_root) || !snd_soc_debugfs_root) {
pr_warn("ASoC: Failed to create debugfs directory\n");
snd_soc_debugfs_root = NULL;
return;
}
if (!debugfs_create_file("codecs", 0444, snd_soc_debugfs_root, NULL,
&codec_list_fops))
pr_warn("ASoC: Failed to create CODEC list debugfs file\n");
if (!debugfs_create_file("dais", 0444, snd_soc_debugfs_root, NULL,
&dai_list_fops))
pr_warn("ASoC: Failed to create DAI list debugfs file\n");
if (!debugfs_create_file("platforms", 0444, snd_soc_debugfs_root, NULL,
&platform_list_fops))
pr_warn("ASoC: Failed to create platform list debugfs file\n");
}
static void snd_soc_debugfs_exit(void)
{
debugfs_remove_recursive(snd_soc_debugfs_root);
}
#else
#define soc_init_codec_debugfs NULL
@ -497,6 +531,15 @@ static inline void soc_init_card_debugfs(struct snd_soc_card *card)
static inline void soc_cleanup_card_debugfs(struct snd_soc_card *card)
{
}
static inline void snd_soc_debugfs_init(void)
{
}
static inline void snd_soc_debugfs_exit(void)
{
}
#endif
struct snd_pcm_substream *snd_soc_get_dai_substream(struct snd_soc_card *card,
@ -3580,26 +3623,7 @@ EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs);
static int __init snd_soc_init(void)
{
#ifdef CONFIG_DEBUG_FS
snd_soc_debugfs_root = debugfs_create_dir("asoc", NULL);
if (IS_ERR(snd_soc_debugfs_root) || !snd_soc_debugfs_root) {
pr_warn("ASoC: Failed to create debugfs directory\n");
snd_soc_debugfs_root = NULL;
}
if (!debugfs_create_file("codecs", 0444, snd_soc_debugfs_root, NULL,
&codec_list_fops))
pr_warn("ASoC: Failed to create CODEC list debugfs file\n");
if (!debugfs_create_file("dais", 0444, snd_soc_debugfs_root, NULL,
&dai_list_fops))
pr_warn("ASoC: Failed to create DAI list debugfs file\n");
if (!debugfs_create_file("platforms", 0444, snd_soc_debugfs_root, NULL,
&platform_list_fops))
pr_warn("ASoC: Failed to create platform list debugfs file\n");
#endif
snd_soc_debugfs_init();
snd_soc_util_init();
return platform_driver_register(&soc_driver);
@ -3609,9 +3633,9 @@ module_init(snd_soc_init);
static void __exit snd_soc_exit(void)
{
snd_soc_util_exit();
snd_soc_debugfs_exit();
#ifdef CONFIG_DEBUG_FS
debugfs_remove_recursive(snd_soc_debugfs_root);
#endif
platform_driver_unregister(&soc_driver);
}

3
sound/soc/soc-dapm.c
View File

@ -1898,6 +1898,9 @@ void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
{
struct dentry *d;
if (!parent)
return;
dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
if (!dapm->debugfs_dapm) {

8
sound/soc/soc-pcm.c
View File

@ -1097,8 +1097,9 @@ static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
stream ? "<-" : "->", be->dai_link->name);
#ifdef CONFIG_DEBUG_FS
dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
fe->debugfs_dpcm_root, &dpcm->state);
if (fe->debugfs_dpcm_root)
dpcm->debugfs_state = debugfs_create_u32(be->dai_link->name, 0644,
fe->debugfs_dpcm_root, &dpcm->state);
#endif
return 1;
}
@ -2807,6 +2808,9 @@ void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
if (!rtd->dai_link)
return;
if (!rtd->card->debugfs_card_root)
return;
rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
rtd->card->debugfs_card_root);
if (!rtd->debugfs_dpcm_root) {