linux-kernel - Re: [PATCH V2] media: imx: imx8mq-mipi

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Date:   Fri, 25 Feb 2022 22:41:14 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "open list:MEDIA DRIVERS FOR FREESCALE IMX" 
        <linux-media@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <linux-staging@...ts.linux.dev>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>, mkl@...gutronix.de,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     usama.anjum@...labora.com, kernel@...labora.com,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH V2] media: imx: imx8mq-mipi_csi2: Remove unneeded code

From:
https://patchwork.linuxtv.org/project/linux-media/patch/20220128170722.1624767-1-usama.anjum@collabora.com/

State	Under Review
Delegated to:	Hans Verkuil

On 2/18/22 4:08 PM, Muhammad Usama Anjum wrote:
> Reminder.
> 
> On 1/28/22 10:07 PM, Muhammad Usama Anjum wrote:
>> ret is constant in imx8mq_mipi_csi_pm_suspend(). This function cannot
>> return error. Remove the return variable. Simplify other functions which
>> are using this function.
>>
>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
>> ---
>> Changes in V2:
>> Removed fixes tag
>> ---
>>  drivers/staging/media/imx/imx8mq-mipi-csi2.c | 16 ++++------------
>>  1 file changed, 4 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/staging/media/imx/imx8mq-mipi-csi2.c b/drivers/staging/media/imx/imx8mq-mipi-csi2.c
>> index 3b9fa75efac6b..c992b845e63d1 100644
>> --- a/drivers/staging/media/imx/imx8mq-mipi-csi2.c
>> +++ b/drivers/staging/media/imx/imx8mq-mipi-csi2.c
>> @@ -693,11 +693,10 @@ static int imx8mq_mipi_csi_async_register(struct csi_state *state)
>>   * Suspend/resume
>>   */
>>  
>> -static int imx8mq_mipi_csi_pm_suspend(struct device *dev)
>> +static void imx8mq_mipi_csi_pm_suspend(struct device *dev)
>>  {
>>  	struct v4l2_subdev *sd = dev_get_drvdata(dev);
>>  	struct csi_state *state = mipi_sd_to_csi2_state(sd);
>> -	int ret = 0;
>>  
>>  	mutex_lock(&state->lock);
>>  
>> @@ -708,8 +707,6 @@ static int imx8mq_mipi_csi_pm_suspend(struct device *dev)
>>  	}
>>  
>>  	mutex_unlock(&state->lock);
>> -
>> -	return ret ? -EAGAIN : 0;
>>  }
>>  
>>  static int imx8mq_mipi_csi_pm_resume(struct device *dev)
>> @@ -742,15 +739,12 @@ static int __maybe_unused imx8mq_mipi_csi_suspend(struct device *dev)
>>  {
>>  	struct v4l2_subdev *sd = dev_get_drvdata(dev);
>>  	struct csi_state *state = mipi_sd_to_csi2_state(sd);
>> -	int ret;
>>  
>> -	ret = imx8mq_mipi_csi_pm_suspend(dev);
>> -	if (ret)
>> -		return ret;
>> +	imx8mq_mipi_csi_pm_suspend(dev);
>>  
>>  	state->state |= ST_SUSPENDED;
>>  
>> -	return ret;
>> +	return 0;
>>  }
>>  
>>  static int __maybe_unused imx8mq_mipi_csi_resume(struct device *dev)
>> @@ -770,9 +764,7 @@ static int __maybe_unused imx8mq_mipi_csi_runtime_suspend(struct device *dev)
>>  	struct csi_state *state = mipi_sd_to_csi2_state(sd);
>>  	int ret;
>>  
>> -	ret = imx8mq_mipi_csi_pm_suspend(dev);
>> -	if (ret)
>> -		return ret;
>> +	imx8mq_mipi_csi_pm_suspend(dev);
>>  
>>  	ret = icc_set_bw(state->icc_path, 0, 0);
>>  	if (ret)