linux-kernel - [PATCH 5.4 413/453] spi: mt7621: Disable clock in probe error path

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Date:   Mon, 28 Dec 2020 13:50:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lukas Wunner <lukas@...ner.de>,
        Qinglang Miao <miaoqinglang@...wei.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.4 413/453] spi: mt7621: Disable clock in probe error path

From: Lukas Wunner <lukas@...ner.de>

commit 24f7033405abe195224ec793dbc3d7a27dec0b98 upstream.

Commit 702b15cb9712 ("spi: mt7621: fix missing clk_disable_unprepare()
on error in mt7621_spi_probe") sought to disable the SYS clock on probe
errors, but only did so for 2 of 3 potentially failing calls:  The clock
needs to be disabled on failure of devm_spi_register_controller() as
well.

Moreover, the commit purports to fix a bug in commit cbd66c626e16 ("spi:
mt7621: Move SPI driver out of staging") but in reality the bug has
existed since the driver was first introduced.

Fixes: 1ab7f2a43558 ("staging: mt7621-spi: add mt7621 support")
Signed-off-by: Lukas Wunner <lukas@...ner.de>
Cc: <stable@...r.kernel.org> # v4.17+: 702b15cb9712: spi: mt7621: fix missing clk_disable_unprepare() on error in mt7621_spi_probe
Cc: <stable@...r.kernel.org> # v4.17+
Cc: Qinglang Miao <miaoqinglang@...wei.com>
Link: https://lore.kernel.org/r/36ad42760087952fb7c10aae7d2628547c26a7ec.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-mt7621.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/spi/spi-mt7621.c
+++ b/drivers/spi/spi-mt7621.c
@@ -382,7 +382,11 @@ static int mt7621_spi_probe(struct platf
 		return ret;
 	}
 
-	return devm_spi_register_controller(&pdev->dev, master);
+	ret = devm_spi_register_controller(&pdev->dev, master);
+	if (ret)
+		clk_disable_unprepare(clk);
+
+	return ret;
 }
 
 static int mt7621_spi_remove(struct platform_device *pdev)