linux-kernel - Re: [PATCH v2 1/4] iio: adc: xilinx: Check for return values in clk related functions

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Date:   Sun, 29 Jul 2018 12:48:26 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Manish Narani <manish.narani@...inx.com>
Cc:     <lakshmi.sai.krishna.potthuri@...inx.com>,
        <michal.simek@...inx.com>, <pmeerw@...erw.net>, <lars@...afoo.de>,
        <knaack.h@....de>, <anirudh@...inx.com>, <sgoud@...inx.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] iio: adc: xilinx: Check for return values in clk
 related functions

On Mon, 23 Jul 2018 20:32:00 +0530
Manish Narani <manish.narani@...inx.com> wrote:

> This patch adds check for return values from clock related functions.
> This was reported by static code analysis tool.
> 
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/xilinx-xadc-core.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
> index 0127e85..23395fc 100644
> --- a/drivers/iio/adc/xilinx-xadc-core.c
> +++ b/drivers/iio/adc/xilinx-xadc-core.c
> @@ -340,6 +340,8 @@ static int xadc_zynq_setup(struct platform_device *pdev,
>  	xadc->zynq_intmask = ~0;
>  
>  	pcap_rate = clk_get_rate(xadc->clk);
> +	if (!pcap_rate)
> +		return -EINVAL;
>  
>  	if (tck_rate > pcap_rate / 2) {
>  		div = 2;
> @@ -887,6 +889,9 @@ static int xadc_write_raw(struct iio_dev *indio_dev,
>  	unsigned long clk_rate = xadc_get_dclk_rate(xadc);
>  	unsigned int div;
>  
> +	if (!clk_rate)
> +		return -EINVAL;
> +
>  	if (info != IIO_CHAN_INFO_SAMP_FREQ)
>  		return -EINVAL;
>  
> @@ -1237,8 +1242,10 @@ static int xadc_probe(struct platform_device *pdev)
>  		goto err_free_irq;
>  
>  	/* Disable all alarms */
> -	xadc_update_adc_reg(xadc, XADC_REG_CONF1, XADC_CONF1_ALARM_MASK,
> -		XADC_CONF1_ALARM_MASK);
> +	ret = xadc_update_adc_reg(xadc, XADC_REG_CONF1, XADC_CONF1_ALARM_MASK,
> +				  XADC_CONF1_ALARM_MASK);
> +	if (ret)
> +		goto err_free_irq;
>  
>  	/* Set thresholds to min/max */
>  	for (i = 0; i < 16; i++) {