[PATCH 1/5] ASoC: SOF: debug: Handle cases when fw_lib_prefix is not set, NULL

[Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>]

From: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>

The firmware libraries are not supported by IPC3, the fw_lib_path is not
a valid parameter and it is always NULL.
Do not create the debugfs file for IPC3 at all as it is not applicable.

With IPC4 some vendors/platforms might not support loadable libraries and
the fw_lib_prefix is left to NULL to indicate this.
Handle such case with allocating "Not supported" string.

Reviewed-by: Marc Herbert <marc.herbert@xxxxxxxxx>
Fixes: 17f4041244e6 ("ASoC: SOF: debug: show firmware/topology prefix/names")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
 sound/soc/sof/debug.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/debug.c b/sound/soc/sof/debug.c
index cf282c8b18af..bf635cc96ede 100644
--- a/sound/soc/sof/debug.c
+++ b/sound/soc/sof/debug.c
@@ -326,8 +326,27 @@ int snd_sof_dbg_init(struct snd_sof_dev *sdev)
 
 	debugfs_create_str("fw_path", 0444, fw_profile,
 			   (char **)&plat_data->fw_filename_prefix);
-	debugfs_create_str("fw_lib_path", 0444, fw_profile,
-			   (char **)&plat_data->fw_lib_prefix);
+	/* library path is not valid for IPC3 */
+	if (plat_data->ipc_type != SOF_IPC_TYPE_3) {
+		/*
+		 * fw_lib_prefix can be NULL if the vendor/platform does not
+		 * support loadable libraries
+		 */
+		if (plat_data->fw_lib_prefix) {
+			debugfs_create_str("fw_lib_path", 0444, fw_profile,
+					   (char **)&plat_data->fw_lib_prefix);
+		} else {
+			static char *fw_lib_path;
+
+			fw_lib_path = devm_kasprintf(sdev->dev, GFP_KERNEL,
+						     "Not supported");
+			if (!fw_lib_path)
+				return -ENOMEM;
+
+			debugfs_create_str("fw_lib_path", 0444, fw_profile,
+					   (char **)&fw_lib_path);
+		}
+	}
 	debugfs_create_str("tplg_path", 0444, fw_profile,
 			   (char **)&plat_data->tplg_filename_prefix);
 	debugfs_create_str("fw_name", 0444, fw_profile,
-- 
2.40.1