[alsa-devel] [PATCH alsa-lib 2/4] ucm: Fix fallback to card_name (shortname) config for ucm1 profiles

[Hans de Goede]

uc_mgr_import_master_config() first calls load_master_config()
with the card's longname and if that fails then calls it again with the
card_name.

Before this commit configuration_filename() would force conf_format to 2
when it the access(fn, R_OK) test failed for the ucm1 longname
master-config filename.

This would cause configuration_filename() to blindly return a filename
under <prefix>/ucm2 without seeing if that is actually there and without
trying to fallback to the old profiles under <prefix>/ucm, breaking the
loading of UCM1 profiles by card_name.

This commit fixes this by modifying configuration_filename() to not set
conf_format when checking for the UCM1 config filename fails.
Instead, to make sure that any errors about opening the file still report
the new path, configuration_filename() now resets the filename to the UCM2
path if the access() check has failed for both the UCM2 and UCM1 paths,
without touching conf_format.

Fixes: aba2260ae7b5 ("ucm: switch to ucm2 directory and v2 format, keep backward compatibility")
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 src/ucm/parser.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/ucm/parser.c b/src/ucm/parser.c
index 17aab054..a7e80de3 100644
--- a/src/ucm/parser.c
+++ b/src/ucm/parser.c
@@ -101,7 +101,6 @@ static void configuration_filename(snd_use_case_mgr_t *uc_mgr,
 	}
 
 	if (uc_mgr->conf_format > 0) {
-__format:
 		configuration_filename2(fn, fn_len, uc_mgr->conf_format,
 					dir, file, suffix);
 		return;
@@ -112,11 +111,11 @@ __format:
 		return;
 
 	configuration_filename2(fn, fn_len, 0, dir, file, suffix);
-	if (access(fn, R_OK)) {
-		/* make sure that the error message refers to the new path */
-		uc_mgr->conf_format = 2;
-		goto __format;
-	}
+	if (access(fn, R_OK) == 0)
+		return;
+
+	/* make sure that the error message refers to the new path */
+	configuration_filename2(fn, fn_len, 2, dir, file, suffix);
 }
 
 /*
-- 
2.23.0