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spi/bcm63xx-hspi: Enable the clock before calling clk_get_rate().

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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: 142168eba9 ("spi: bcm63xx-hsspi: add bcm63xx HSSPI driver")
Signed-off-by: Stefan Potyra <Stefan.Potyra@elektrobit.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Stefan Potyra 2018-04-26 09:28:02 +02:00 committed by Mark Brown
parent b6a4b39152
commit 0d7412ed1f
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GPG key ID: 24D68B725D5487D0
1 changed files with 17 additions and 8 deletions
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25
drivers/spi/spi-bcm63xx-hsspi.c
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@ -352,21 +352,30 @@ 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);
rate = clk_get_rate(pll_clk);
if (!rate)
return -EINVAL;
if (IS_ERR(pll_clk)) {
ret = PTR_ERR(pll_clk);
goto out_disable_clk;
}
ret = clk_prepare_enable(clk);
ret = clk_prepare_enable(pll_clk);
if (ret)
return ret;
goto out_disable_clk;
rate = clk_get_rate(pll_clk);
clk_disable_unprepare(pll_clk);
if (!rate) {
ret = -EINVAL;
goto out_disable_clk;
}
}
master = spi_alloc_master(&pdev->dev, sizeof(*bs));
if (!master) {