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ucm: add a check for the empty configuration

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Return an error if the UCM configuration is empty (no verbs
or no boot sequence).

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-10-06 10:40:40 +02:00
parent e80f35611d
commit 22d5ca8b6b
1 changed files with 23 additions and 3 deletions
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26
src/ucm/main.c
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@ -568,6 +568,20 @@ static int import_master_config(snd_use_case_mgr_t *uc_mgr)
return add_auto_values(uc_mgr);
}
/**
* \brief Check, if the UCM configuration is empty
* \param uc_mgr Use case Manager
* \return zero on success, otherwise a negative error code
*/
static int check_empty_configuration(snd_use_case_mgr_t *uc_mgr)
{
if (!list_empty(&uc_mgr->verb_list))
return 0;
if (!list_empty(&uc_mgr->once_list))
return 0;
return -ENXIO;
}
/**
* \brief Universal find - string in a list
* \param list List of structures
@ -981,14 +995,20 @@ int snd_use_case_mgr_open(snd_use_case_mgr_t **uc_mgr,
err = import_master_config(mgr);
if (err < 0) {
uc_error("error: failed to import %s use case configuration %d",
card_name, err);
goto err;
card_name, err);
goto _err;
}
err = check_empty_configuration(mgr);
if (err < 0) {
uc_error("error: failed to import %s (empty configuration)", card_name);
goto _err;
}
*uc_mgr = mgr;
return 0;
err:
_err:
uc_mgr_free(mgr);
return err;
}