Since the UCM profiles for all Bay- and Cherry-Trail SST cards have been moved over to UCM2, parsing them fails with:

ALSA lib ucm_subs.c:220:(uc_mgr_get_substituted_value) variable '${CardComponents}' is not defined in this context!

This completely breaks audio support on all Bay- and Cherry-Trail devices.

This is caused by these non-SOF ASoC using cards having an empty CardComponents list. Which in itself is fine, but is rejected by the ucm_subs.c code. This commit changes the ucm_subs code to accept an empty string as a valid value for CardComponents restoring audio functionality on these boards.

Signed-off-by: Hans de Goede hdegoede@redhat.com --- src/ucm/ucm_subs.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/src/ucm/ucm_subs.c b/src/ucm/ucm_subs.c index 00afa9e3..90e395f0 100644 --- a/src/ucm/ucm_subs.c +++ b/src/ucm/ucm_subs.c @@ -25,6 +25,7 @@ */

#include "ucm_local.h" +#include <stdbool.h> #include <sys/stat.h> #include <limits.h>

@@ -145,10 +146,11 @@ static char *rval_sysfs(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char return strdup(path); }

-#define MATCH_VARIABLE(name, id, fcn) \ +#define MATCH_VARIABLE(name, id, fcn, empty_ok) \ if (strncmp((name), (id), sizeof(id) - 1) == 0) { \ rval = fcn(uc_mgr); \ idsize = sizeof(id) - 1; \ + allow_empty = (empty_ok); \ goto __rval; \ }

@@ -189,12 +191,14 @@ int uc_mgr_get_substituted_value(snd_use_case_mgr_t *uc_mgr,

while (*value) { if (*value == '$' && *(value+1) == '{') { - MATCH_VARIABLE(value, "${ConfName}", rval_conf_name); - MATCH_VARIABLE(value, "${CardId}", rval_card_id); - MATCH_VARIABLE(value, "${CardDriver}", rval_card_driver); - MATCH_VARIABLE(value, "${CardName}", rval_card_name); - MATCH_VARIABLE(value, "${CardLongName}", rval_card_longname); - MATCH_VARIABLE(value, "${CardComponents}", rval_card_components); + bool allow_empty = false; + + MATCH_VARIABLE(value, "${ConfName}", rval_conf_name, false); + MATCH_VARIABLE(value, "${CardId}", rval_card_id, false); + MATCH_VARIABLE(value, "${CardDriver}", rval_card_driver, false); + MATCH_VARIABLE(value, "${CardName}", rval_card_name, false); + MATCH_VARIABLE(value, "${CardLongName}", rval_card_longname, false); + MATCH_VARIABLE(value, "${CardComponents}", rval_card_components, true); MATCH_VARIABLE2(value, "${env:", rval_env); MATCH_VARIABLE2(value, "${sys:", rval_sysfs); err = -EINVAL; @@ -208,7 +212,7 @@ int uc_mgr_get_substituted_value(snd_use_case_mgr_t *uc_mgr, } goto __error; __rval: - if (rval == NULL || rval[0] == '\0') { + if (rval == NULL || (!allow_empty && rval[0] == '\0')) { free(rval); strncpy(r, value, idsize); r[idsize] = '\0';