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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
        Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>,
        Mark Brown <broonie@kernel.org>,
        thongsyho <thong.ho.px@rvc.renesas.com>,
        Nhan Nguyen <nhan.nguyen.yb@renesas.com>
Subject: [PATCH 4.9 88/92] ASoC: rsnd: dont call free_irq() on Parent SSI
Date:   Fri,  9 Feb 2018 14:39:57 +0100
Message-Id: <20180209133937.429631758@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

commit 1f8754d4daea5f257370a52a30fcb22798c54516 upstream.

If SSI uses shared pin, some SSI will be used as parent SSI.
Then, normal SSI's remove and Parent SSI's remove
(these are same SSI) will be called when unbind or remove timing.
In this case, free_irq() will be called twice.
This patch solve this issue.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Reported-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: thongsyho <thong.ho.px@rvc.renesas.com>
Signed-off-by: Nhan Nguyen <nhan.nguyen.yb@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 sound/soc/sh/rcar/ssi.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -699,9 +699,14 @@ static int rsnd_ssi_dma_remove(struct rs
 			       struct rsnd_priv *priv)
 {
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
+	struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
 	struct device *dev = rsnd_priv_to_dev(priv);
 	int irq = ssi->irq;
 
+	/* Do nothing for SSI parent mod */
+	if (ssi_parent_mod == mod)
+		return 0;
+
 	/* PIO will request IRQ again */
 	devm_free_irq(dev, irq, mod);