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authorStefan Potyra <Stefan.Potyra@elektrobit.com>2018-04-26 09:28:02 +0200
committerMark Brown <broonie@kernel.org>2018-04-26 12:41:22 +0100
commit0d7412ed1f5dc0858eb4f29650a8c9c5cce8b285 (patch)
treed075e8c26ade988fe75d33ff9528c4ac724feae1 /drivers/spi/spi-bcm63xx-hsspi.c
parentb6a4b39152b574af8e4264292fe8fa5368fa1d74 (diff)
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> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-bcm63xx-hsspi.c')
-rw-r--r--drivers/spi/spi-bcm63xx-hsspi.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c
index cbcba614b253..c23849f7aa7b 100644
--- a/drivers/spi/spi-bcm63xx-hsspi.c
+++ b/drivers/spi/spi-bcm63xx-hsspi.c
@@ -352,22 +352,31 @@ 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;
+ }
+
+ ret = clk_prepare_enable(pll_clk);
+ if (ret)
+ goto out_disable_clk;
rate = clk_get_rate(pll_clk);
- if (!rate)
- return -EINVAL;
+ clk_disable_unprepare(pll_clk);
+ 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;