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SubjectApplied "ASoC: fsl_esai: Add freq check in set_dai_sysclk()" to the asoc tree
The patch

ASoC: fsl_esai: Add freq check in set_dai_sysclk()

has been applied to the asoc tree at

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From 8a2278b7fb3df67cd415c679ba1a0e5e4a1761a7 Mon Sep 17 00:00:00 2001
From: Nicolin Chen <>
Date: Sun, 8 Apr 2018 17:33:54 -0700
Subject: [PATCH] ASoC: fsl_esai: Add freq check in set_dai_sysclk()

The freq parameter indicates the physical frequency of an actual
input clock or a desired frequency of an output clock for HCKT/R.
It should never be passed 0. This might cause Division-by-zero.

So this patch adds a check to fix it.

Signed-off-by: Nicolin Chen <>
Reviewed-by: Fabio Estevam <>
Signed-off-by: Mark Brown <>
sound/soc/fsl/fsl_esai.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index da8fd98c7f51..d79e99ef31ad 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -226,6 +226,12 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned long clk_rate;
int ret;

+ if (freq == 0) {
+ dev_err(dai->dev, "%sput freq of HCK%c should not be 0Hz\n",
+ in ? "in" : "out", tx ? 'T' : 'R');
+ return -EINVAL;
+ }
/* Bypass divider settings if the requirement doesn't change */
if (freq == esai_priv->hck_rate[tx] && dir == esai_priv->hck_dir[tx])
return 0;
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