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Subject: Re: [PATCH 1/2] staging: media: omap4iss: Ending line with argument
To:     Beatriz Martins de Carvalho <martinsdecarvalhobeatriz@gmail.com>,
        laurent.pinchart@ideasonboard.com, mchehab@kernel.org,
        gregkh@linuxfoundation.org, linux-media@vger.kernel.org,
        linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
        outreachy-kernel@googlegroups.com
References: <cover.1617287509.git.martinsdecarvalhobeatriz@gmail.com>
 <441d27060ff6477d0ad418f41e194b96373c1f7f.1617287509.git.martinsdecarvalhobeatriz@gmail.com>
From:   Hans Verkuil <hverkuil@xs4all.nl>
Message-ID: <e1b25826-1359-24dd-47ad-41fbd3a406b9@xs4all.nl>
Date:   Wed, 7 Apr 2021 15:46:12 +0200
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Hi Beatriz,

I'm now reviewing staging/media patches instead of Greg KH. See Vaishali's
email from today: "Sending patches for the drivers/staging/media".

On 01/04/2021 17:07, Beatriz Martins de Carvalho wrote:
> Remove checkpatch check "CHECK: Lines should not end with a '('" with
> argument present in next line and reorganize characters so the lines
> are under 100 columns
> 
> Signed-off-by: Beatriz Martins de Carvalho <martinsdecarvalhobeatriz@gmail.com>
> ---
>  drivers/staging/media/omap4iss/iss.c | 46 +++++++++++++---------------
>  1 file changed, 22 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/staging/media/omap4iss/iss.c b/drivers/staging/media/omap4iss/iss.c
> index dae9073e7d3c..e8f724dbf810 100644
> --- a/drivers/staging/media/omap4iss/iss.c
> +++ b/drivers/staging/media/omap4iss/iss.c
> @@ -559,9 +559,10 @@ static int iss_reset(struct iss_device *iss)
>  	iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
>  		    ISS_HL_SYSCONFIG_SOFTRESET);
>  
> -	timeout = iss_poll_condition_timeout(
> -		!(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
> -		ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
> +	timeout = iss_poll_condition_timeout(!(iss_reg_read(iss,
> +							    OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG)
> +							    & ISS_HL_SYSCONFIG_SOFTRESET),
> +							    1000, 10, 100);
>  	if (timeout) {
>  		dev_err(iss->dev, "ISS reset timeout\n");
>  		return -ETIMEDOUT;
> @@ -583,9 +584,10 @@ static int iss_isp_reset(struct iss_device *iss)
>  
>  	iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
>  
> -	timeout = iss_poll_condition_timeout(
> -		iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
> -		ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
> +	timeout = iss_poll_condition_timeout(iss_reg_read(iss,
> +							  OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL)
> +							  & ISP5_CTRL_MSTANDBY_WAIT, 1000000,
> +							  1000, 1500);
>  	if (timeout) {
>  		dev_err(iss->dev, "ISP5 standby timeout\n");
>  		return -ETIMEDOUT;
> @@ -595,9 +597,10 @@ static int iss_isp_reset(struct iss_device *iss)
>  	iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
>  		    ISP5_SYSCONFIG_SOFTRESET);
>  
> -	timeout = iss_poll_condition_timeout(
> -		!(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
> -		ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
> +	timeout = iss_poll_condition_timeout(!(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1,
> +							    ISP5_SYSCONFIG) &
> +							    ISP5_SYSCONFIG_SOFTRESET), 1000000,
> +							    1000, 1500);

As several other people already commented, these changes do not improve readability.
Just leave this code alone, it's good enough. Even splitting up the condition into
a separate function would degrade readability since that would make it harder to
discover the exact condition that will be polled for.

Not everything that checkpatch.pl flags is necessarily bad code :-)

>  	if (timeout) {
>  		dev_err(iss->dev, "ISP5 reset timeout\n");
>  		return -ETIMEDOUT;
> @@ -1104,33 +1107,28 @@ static int iss_create_links(struct iss_device *iss)
>  	}
>  
>  	/* Connect the submodules. */
> -	ret = media_create_pad_link(
> -			&iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
> -			&iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
> +	ret = media_create_pad_link(&iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
> +				    &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = media_create_pad_link(
> -			&iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
> -			&iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
> +	ret = media_create_pad_link(&iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
> +				    &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = media_create_pad_link(
> -			&iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
> -			&iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
> +	ret = media_create_pad_link(&iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
> +				    &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = media_create_pad_link(
> -			&iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
> -			&iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
> +	ret = media_create_pad_link(&iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
> +				    &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = media_create_pad_link(
> -			&iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
> -			&iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
> +	ret = media_create_pad_link(&iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
> +				    &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
>  	if (ret < 0)
>  		return ret;
>  
> 

These, however, are readability improvements, so I'm happy with that.

Regards,

	Hans