linux-kernel - [PATCH][next] ASoC: SOF: ipc4-topology: Fix a less than zero check on a u32

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Message-ID: <20250902083213.2620124-1-colin.i.king@gmail.com>
Date: Tue,  2 Sep 2025 09:32:13 +0100
From: Colin Ian King <colin.i.king@...il.com>
To: Liam Girdwood <lgirdwood@...il.com>,
	Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
	Bard Liao <yung-chuan.liao@...ux.intel.com>,
	Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
	Daniel Baluta <daniel.baluta@....com>,
	Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	sound-open-firmware@...a-project.org,
	linux-sound@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH][next] ASoC: SOF: ipc4-topology: Fix a less than zero check on a u32

Currently the error check from the call to sof_ipc4_get_sample_type
is always false because a u32 variable out_ref_type is being used
to perform the less than zero check. Fix this by using the int
variable ret to perform the check.

Fixes: c04c2e829649 ("ASoC: SOF: ipc4-topology: Add support for 8-bit formats")
Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 sound/soc/sof/ipc4-topology.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index f5e62cd8fc0c..b6a732d0adb4 100644
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -2191,9 +2191,10 @@ sof_ipc4_prepare_copier_module(struct snd_sof_widget *swidget,
 	case snd_soc_dapm_dai_in:
 		out_ref_rate = params_rate(fe_params);
 		out_ref_channels = params_channels(fe_params);
-		out_ref_type = sof_ipc4_get_sample_type(sdev, fe_params);
-		if (out_ref_type < 0)
-			return out_ref_type;
+		ret = sof_ipc4_get_sample_type(sdev, fe_params);
+		if (ret < 0)
+			return ret;
+		out_ref_type = (u32)ret;
 
 		if (!single_output_bitdepth) {
 			out_ref_valid_bits = sof_ipc4_get_valid_bits(sdev, fe_params);
-- 
2.51.0