linux-kernel - [PATCH] ASoC: simple-card-utils: fix PCM constraint error check

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Date:   Thu,  1 Jun 2023 19:19:35 -0600
From:   Robert Hancock <robert.hancock@...ian.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Robert Hancock <robert.hancock@...ian.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: simple-card-utils: fix PCM constraint error check

The code in asoc_simple_startup was treating any non-zero return from
snd_pcm_hw_constraint_minmax as an error, when this can return 1 in some
normal cases and only negative values indicate an error.

When this happened, it caused asoc_simple_startup to disable the clocks
it just enabled and return 1, which was not treated as an error by the
calling code which only checks for negative return values. Then when the
PCM is eventually shut down, it causes the clock framework to complain
about disabling clocks that were not enabled.

Fix the check for snd_pcm_hw_constraint_minmax return value to only
treat negative values as an error.

Fixes: 5ca2ab459817 ("ASoC: simple-card-utils: Add new system-clock-fixed flag")
Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
---
 sound/soc/generic/simple-card-utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 467edd96eae5..e5ff61c1e9d1 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -314,7 +314,7 @@ int asoc_simple_startup(struct snd_pcm_substream *substream)
 		}
 		ret = snd_pcm_hw_constraint_minmax(substream->runtime, SNDRV_PCM_HW_PARAM_RATE,
 			fixed_rate, fixed_rate);
-		if (ret)
+		if (ret < 0)
 			goto codec_err;
 	}

-- 
2.40.1