[PATCH 4.19 060/116] spi: mt7621: Disable clock in probe error path

[Greg Kroah-Hartman]

From: Lukas Wunner <lukas@xxxxxxxxx>

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@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>
Link: https://lore.kernel.org/r/36ad42760087952fb7c10aae7d2628547c26a7ec.1607286887.git.lukas@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
[lukas: backport to v4.19.192]
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/staging/mt7621-spi/spi-mt7621.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/staging/mt7621-spi/spi-mt7621.c
+++ b/drivers/staging/mt7621-spi/spi-mt7621.c
@@ -487,7 +487,11 @@ static int mt7621_spi_probe(struct platf
 
 	mt7621_spi_reset(rs, 0);
 
-	return spi_register_master(master);
+	ret = spi_register_master(master);
+	if (ret)
+		clk_disable_unprepare(clk);
+
+	return ret;
 }
 
 static int mt7621_spi_remove(struct platform_device *pdev)