linux-kernel - [PATCH v4] spi/bcm63xx-hspi: Enable the clock before calling clk_get

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Date:   Wed, 25 Apr 2018 18:49:06 +0200
From:   Stefan Potyra <Stefan.Potyra@...ktrobit.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Florian Fainelli <florian.fainelli@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        <bcm-kernel-feedback-list@...adcom.com>,
        <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Jonas Gorski <jonas.gorski@...il.com>,
        <ldv-project@...uxtesting.org>, <sil2review@...ts.osadl.org>
Subject: [PATCH v4] spi/bcm63xx-hspi: Enable the clock before calling
 clk_get_rate().

Enable the clock prior to calling clk_get_rate(), because clk_get_rate()
should only be called if the clock is enabled.

Additionally, prepare/enable the pll_clk before calling clk_get_rate()
for the same reason.

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

Fixes: 142168eba9dc ("spi: bcm63xx-hsspi: add bcm63xx HSSPI driver")
Signed-off-by: Stefan Potyra <Stefan.Potyra@...ktrobit.com>
---
 drivers/spi/spi-bcm63xx-hsspi.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c
index cbcba614b253..8475703543e5 100644
--- a/drivers/spi/spi-bcm63xx-hsspi.c
+++ b/drivers/spi/spi-bcm63xx-hsspi.c
@@ -352,22 +352,27 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);
 
+	ret = clk_prepare_enable(clk);
+	if (ret)
+		return ret;
+
 	rate = clk_get_rate(clk);
 	if (!rate) {
 		struct clk *pll_clk = devm_clk_get(dev, "pll");
 
-		if (IS_ERR(pll_clk))
-			return PTR_ERR(pll_clk);
+		if (IS_ERR(pll_clk)) {
+			ret = PTR_ERR(pll_clk);
+			goto out_disable_clk;
+		}
+
 
 		rate = clk_get_rate(pll_clk);
-		if (!rate)
-			return -EINVAL;
+		if (!rate) {
+			ret = -EINVAL;
+			goto out_disable_clk;
+		}
 	}
 
-	ret = clk_prepare_enable(clk);
-	if (ret)
-		return ret;
-
 	master = spi_alloc_master(&pdev->dev, sizeof(*bs));
 	if (!master) {
 		ret = -ENOMEM;
-- 
2.17.0


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