[PATCH] ASoC: rsnd: fixup unsigned expression compared with zero: main_rate

[Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>]

From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>

This patch fixes this WARNING

sound/soc/sh/rcar/ssi.c:285:5-14: WARNING: Unsigned expression\
	compared with zero: main_rate < 0

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---

Mark, Julia

I think this patch solves reported issue, but my compiler
and smatch doesn't indicate it.
Thus, I couldn't confirm it.

 sound/soc/sh/rcar/core.c | 2 +-
 sound/soc/sh/rcar/rsnd.h | 2 +-
 sound/soc/sh/rcar/ssi.c  | 8 ++++----
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c
index 4892c0a..409bac3 100644
--- a/sound/soc/sh/rcar/core.c
+++ b/sound/soc/sh/rcar/core.c
@@ -763,7 +763,7 @@ static int rsnd_soc_hw_rule(struct rsnd_priv *priv,
 			    struct snd_interval *baseline, struct snd_interval *iv)
 {
 	struct snd_interval p;
-	int rate;
+	unsigned int rate;
 	int i;
 
 	snd_interval_any(&p);
diff --git a/sound/soc/sh/rcar/rsnd.h b/sound/soc/sh/rcar/rsnd.h
index 9428d4e..99c5761 100644
--- a/sound/soc/sh/rcar/rsnd.h
+++ b/sound/soc/sh/rcar/rsnd.h
@@ -680,7 +680,7 @@ void rsnd_ssi_parse_hdmi_connection(struct rsnd_priv *priv,
 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai,
 			    struct device_node *playback,
 			    struct device_node *capture);
-int rsnd_ssi_clk_query(struct rsnd_priv *priv,
+unsigned int rsnd_ssi_clk_query(struct rsnd_priv *priv,
 		       int param1, int param2, int *idx);
 
 /*
diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index c8956c3..46feddd 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -208,14 +208,14 @@ u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io)
 	return 0;
 }
 
-int rsnd_ssi_clk_query(struct rsnd_priv *priv,
+unsigned int rsnd_ssi_clk_query(struct rsnd_priv *priv,
 		       int param1, int param2, int *idx)
 {
 	int ssi_clk_mul_table[] = {
 		1, 2, 4, 8, 16, 6, 12,
 	};
 	int j, ret;
-	int main_rate;
+	unsigned int main_rate;
 
 	for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) {
 
@@ -245,7 +245,7 @@ int rsnd_ssi_clk_query(struct rsnd_priv *priv,
 		return main_rate;
 	}
 
-	return -EINVAL;
+	return 0;
 }
 
 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
@@ -282,7 +282,7 @@ static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
 	}
 
 	main_rate = rsnd_ssi_clk_query(priv, rate, chan, &idx);
-	if (main_rate < 0) {
+	if (!main_rate) {
 		dev_err(dev, "unsupported clock rate\n");
 		return -EIO;
 	}
-- 
1.9.1