linux-kernel - Re: [PATCH v1] coresight: Drop double check for ACPI companion device

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Message-ID: <20200601195721.GA24287@xps15>
Date:   Mon, 1 Jun 2020 13:57:21 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH v1] coresight: Drop double check for ACPI companion device

Hi Andy,

On Fri, May 29, 2020 at 04:32:10PM +0300, Andy Shevchenko wrote:
> acpi_dev_get_resources() does perform the NULL pointer check against
> ACPI companion device which is given as function parameter. Thus,
> there is no need to duplicate this check in the caller.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/hwtracing/coresight/coresight-stm.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index b908ca104645..673d2f56ed1e 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -727,8 +727,6 @@ static int acpi_stm_get_stimulus_area(struct device *dev, struct resource *res)
>  
>  	struct acpi_device *adev = ACPI_COMPANION(dev);
>  
> -	if (!adev)
> -		return -ENODEV;
>  	rc = acpi_dev_get_resources(adev, &res_list, NULL, NULL);
>  	if (rc < 0)
>  		return rc;

I have applied your patch.

Thanks,
Mathieu

> -- 
> 2.26.2
>