ASoC: rsnd: call unregister for null_hw when removed

commit d6956a7 ("ASoC: rsnd: add null CLOCKIN support")
added null_clk, but it is using local static valuable.
It will be leaked if rsnd driver was removed.
This patch moves it to priv, and call unregister when removing.

Fixes: d6956a7 ("ASoC: rsnd: add null CLOCKIN support")
Link: https://lore.kernel.org/r/87tumsoe2p.wl-kuninori.morimoto.gx@renesas.com
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Message-Id: <877djknbl5.wl-kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/adg.c

@@ -392,10 +392,9 @@ void rsnd_adg_clk_control(struct rsnd_priv *priv, int enable)
 #define NULL_CLK "rsnd_adg_null"
 static struct clk *rsnd_adg_null_clk_get(struct rsnd_priv *priv)
 {
-	static struct clk_hw *hw;
 	struct device *dev = rsnd_priv_to_dev(priv);
 
-	if (!hw) {
+	if (!priv->null_hw) {
 		struct clk_hw *_hw;
 		int ret;
 
@@ -407,10 +406,10 @@ static struct clk *rsnd_adg_null_clk_get(struct rsnd_priv *priv)
 		if (ret < 0)
 			clk_hw_unregister_fixed_rate(_hw);
 
-		hw = _hw;
+		priv->null_hw = _hw;
 	}
 
-	return clk_hw_get_clk(hw, NULL_CLK);
+	return clk_hw_get_clk(priv->null_hw, NULL_CLK);
 }
 
 static void rsnd_adg_get_clkin(struct rsnd_priv *priv,
@@ -649,6 +648,8 @@ void rsnd_adg_remove(struct rsnd_priv *priv)
 	for_each_rsnd_clkout(clk, adg, i)
 		if (adg->clkout[i])
 			clk_unregister_fixed_rate(adg->clkout[i]);
+	if (priv->null_hw)
+		clk_hw_unregister_fixed_rate(priv->null_hw);
 
 	of_clk_del_provider(np);
 

sound/soc/sh/rcar/rsnd.h

@@ -635,6 +635,7 @@ struct rsnd_priv {
 	 * below value will be filled on rsnd_adg_probe()
 	 */
 	void *adg;
+	struct clk_hw *null_hw;
 
 	/*
 	 * below value will be filled on rsnd_dma_probe()