linux-kernel - [PATCH] ASoC: mediatek: mtk-btcvsd: Fix an error handling path in 'mtk_btcvsd_snd

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Date:   Sun,  6 Jun 2021 16:31:09 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, matthias.bgg@...il.com,
        pierre-louis.bossart@...ux.intel.com, lumi.lee@...iatek.com,
        kaichieh.chuang@...iatek.com
Cc:     alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] ASoC: mediatek: mtk-btcvsd: Fix an error handling path in 'mtk_btcvsd_snd_probe()'

If an error occurs after a successful 'of_iomap()' call, it must be undone
by a corresponding 'iounmap()' call, as already done in the remove
function.

While at it, remove the useless initialization of 'ret' at the beginning of
the function.

Fixes: 4bd8597dc36c ("ASoC: mediatek: add btcvsd driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This is NOT compile tested.

Even if CONFIG_SND_SOC_MTK_BTCVSD is correctly set in my .config file, I've
not been able to have this file compiled.
---
 sound/soc/mediatek/common/mtk-btcvsd.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/sound/soc/mediatek/common/mtk-btcvsd.c b/sound/soc/mediatek/common/mtk-btcvsd.c
index f85b5ea180ec..d884bb7c0fc7 100644
--- a/sound/soc/mediatek/common/mtk-btcvsd.c
+++ b/sound/soc/mediatek/common/mtk-btcvsd.c
@@ -1281,7 +1281,7 @@ static const struct snd_soc_component_driver mtk_btcvsd_snd_platform = {
 
 static int mtk_btcvsd_snd_probe(struct platform_device *pdev)
 {
-	int ret = 0;
+	int ret;
 	int irq_id;
 	u32 offset[5] = {0, 0, 0, 0, 0};
 	struct mtk_btcvsd_snd *btcvsd;
@@ -1337,7 +1337,8 @@ static int mtk_btcvsd_snd_probe(struct platform_device *pdev)
 	btcvsd->bt_sram_bank2_base = of_iomap(dev->of_node, 1);
 	if (!btcvsd->bt_sram_bank2_base) {
 		dev_err(dev, "iomap bt_sram_bank2_base fail\n");
-		return -EIO;
+		ret = -EIO;
+		goto unmap_pkv_err;
 	}
 
 	btcvsd->infra = syscon_regmap_lookup_by_phandle(dev->of_node,
@@ -1345,7 +1346,8 @@ static int mtk_btcvsd_snd_probe(struct platform_device *pdev)
 	if (IS_ERR(btcvsd->infra)) {
 		dev_err(dev, "cannot find infra controller: %ld\n",
 			PTR_ERR(btcvsd->infra));
-		return PTR_ERR(btcvsd->infra);
+		ret = PTR_ERR(btcvsd->infra);
+		goto unmap_bank2_err;
 	}
 
 	/* get offset */
@@ -1354,7 +1356,7 @@ static int mtk_btcvsd_snd_probe(struct platform_device *pdev)
 					 ARRAY_SIZE(offset));
 	if (ret) {
 		dev_warn(dev, "%s(), get offset fail, ret %d\n", __func__, ret);
-		return ret;
+		goto unmap_bank2_err;
 	}
 	btcvsd->infra_misc_offset = offset[0];
 	btcvsd->conn_bt_cvsd_mask = offset[1];
@@ -1373,8 +1375,18 @@ static int mtk_btcvsd_snd_probe(struct platform_device *pdev)
 	mtk_btcvsd_snd_set_state(btcvsd, btcvsd->tx, BT_SCO_STATE_IDLE);
 	mtk_btcvsd_snd_set_state(btcvsd, btcvsd->rx, BT_SCO_STATE_IDLE);
 
-	return devm_snd_soc_register_component(dev, &mtk_btcvsd_snd_platform,
-					       NULL, 0);
+	ret = devm_snd_soc_register_component(dev, &mtk_btcvsd_snd_platform,
+					      NULL, 0);
+	if (ret)
+		goto unmap_bank2_err;
+
+	return 0;
+
+unmap_bank2_err:
+	iounmap(btcvsd->bt_sram_bank2_base);
+unmap_pkv_err:
+	iounmap(btcvsd->bt_pkv_base);
+	return ret;
 }
 
 static int mtk_btcvsd_snd_remove(struct platform_device *pdev)
-- 
2.30.2