linux-kernel - [PATCH] mmc: sdhci-pxav2: add error handling of clk_prepare

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Date:   Sat, 11 Feb 2017 01:54:46 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] mmc: sdhci-pxav2: add error handling of clk_prepare_enable()

There is no check if clk_prepare_enable() succeed in sdhci_pxav2_probe().

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/mmc/host/sdhci-pxav2.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-pxav2.c b/drivers/mmc/host/sdhci-pxav2.c
index 347eae2d7b6a..80513f54e9d4 100644
--- a/drivers/mmc/host/sdhci-pxav2.c
+++ b/drivers/mmc/host/sdhci-pxav2.c
@@ -185,7 +185,11 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
 		goto err_clk_get;
 	}
 	pltfm_host->clk = clk;
-	clk_prepare_enable(clk);
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to enable io clock\n");
+		goto err_clk_enable;
+	}
 
 	host->quirks = SDHCI_QUIRK_BROKEN_ADMA
 		| SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
@@ -228,6 +232,7 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
 
 err_add_host:
 	clk_disable_unprepare(clk);
+err_clk_enable:
 	clk_put(clk);
 err_clk_get:
 	sdhci_pltfm_free(pdev);
-- 
2.7.4