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Date: Wed, 18 Oct 2017 13:40:12 +0200 From: Fabrice Gasnier <fabrice.gasnier@...com> To: <jic23@...nel.org> CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>, <fabrice.gasnier@...com>, <benjamin.gaignard@...com>, <benjamin.gaignard@...aro.org>, <linux-iio@...r.kernel.org>, <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net> Subject: [PATCH] iio: adc: stm32: add check on clock rate Add check on STM32 ADC clock rate to report an explicit error. This may avoid division by 0 later in stm32-adc driver. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com> --- drivers/iio/adc/stm32-adc-core.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c index 804198e..6aefef9 100644 --- a/drivers/iio/adc/stm32-adc-core.c +++ b/drivers/iio/adc/stm32-adc-core.c @@ -139,6 +139,11 @@ static int stm32f4_adc_clk_sel(struct platform_device *pdev, } rate = clk_get_rate(priv->aclk); + if (!rate) { + dev_err(&pdev->dev, "Invalid clock rate: 0\n"); + return -EINVAL; + } + for (i = 0; i < ARRAY_SIZE(stm32f4_pclk_div); i++) { if ((rate / stm32f4_pclk_div[i]) <= STM32F4_ADC_MAX_CLK_RATE) break; @@ -216,6 +221,10 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev, * From spec: PLL output musn't exceed max rate */ rate = clk_get_rate(priv->aclk); + if (!rate) { + dev_err(&pdev->dev, "Invalid adc clock rate: 0\n"); + return -EINVAL; + } for (i = 0; i < ARRAY_SIZE(stm32h7_adc_ckmodes_spec); i++) { ckmode = stm32h7_adc_ckmodes_spec[i].ckmode; @@ -232,6 +241,10 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev, /* Synchronous clock modes (e.g. ckmode is 1, 2 or 3) */ rate = clk_get_rate(priv->bclk); + if (!rate) { + dev_err(&pdev->dev, "Invalid bus clock rate: 0\n"); + return -EINVAL; + } for (i = 0; i < ARRAY_SIZE(stm32h7_adc_ckmodes_spec); i++) { ckmode = stm32h7_adc_ckmodes_spec[i].ckmode; -- 1.9.1
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