linux-kernel - [PATCH v2] spi: meson-spicc: Fix error handling in meson_spicc

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Date:   Sun, 29 Apr 2018 01:46:23 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Mark Brown <broonie@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH v2] spi: meson-spicc: Fix error handling in meson_spicc_probe()

If devm_spi_register_master() fails in meson_spicc_probe(),
spicc->core is left undisabled. The patch fixes that.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
---
v2: Fix subject as Neil Armstrong noted.

 drivers/spi/spi-meson-spicc.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c
index 5c82910e3480..7fe4488ace57 100644
--- a/drivers/spi/spi-meson-spicc.c
+++ b/drivers/spi/spi-meson-spicc.c
@@ -574,10 +574,15 @@ static int meson_spicc_probe(struct platform_device *pdev)
 		master->max_speed_hz = rate >> 2;
 
 	ret = devm_spi_register_master(&pdev->dev, master);
-	if (!ret)
-		return 0;
+	if (ret) {
+		dev_err(&pdev->dev, "spi master registration failed\n");
+		goto out_clk;
+	}
 
-	dev_err(&pdev->dev, "spi master registration failed\n");
+	return 0;
+
+out_clk:
+	clk_disable_unprepare(spicc->core);
 
 out_master:
 	spi_master_put(master);
-- 
2.7.4