[PATCH 13/17] spi: mt7621: Disable clock in probe error path

[Lukas Wunner <lukas@xxxxxxxxx>]

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@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.17+: 702b15cb9712: spi: mt7621: fix missing clk_disable_unprepare() on error in mt7621_spi_probe
Cc: <stable@xxxxxxxxxxxxxxx> # v4.17+
Cc: Qinglang Miao <miaoqinglang@xxxxxxxxxx>
---
 drivers/spi/spi-mt7621.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mt7621.c b/drivers/spi/spi-mt7621.c
index 2cdae7994e2a..e227700808cb 100644
--- a/drivers/spi/spi-mt7621.c
+++ b/drivers/spi/spi-mt7621.c
@@ -382,7 +382,11 @@ static int mt7621_spi_probe(struct platform_device *pdev)
 		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)
-- 
2.29.2