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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@elektrobit.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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