linux-kernel - Re: [PATCH 05/17] media: atomisp: pci: fix inverted error check for ia_css_mipi_is_source_port

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Date:   Tue, 2 Nov 2021 14:33:32 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Tsuchiya Yuto <kitakar@...il.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Patrik Gfeller <patrik.gfeller@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Aline Santana Cordeiro <alinesantanacordeiro@...il.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Alan <alan@...ux.intel.com>,
        Dinghao Liu <dinghao.liu@....edu.cn>,
        Deepak R Varma <drv@...lo.com>,
        Alex Dewar <alex.dewar90@...il.com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/17] media: atomisp: pci: fix inverted error check for
 ia_css_mipi_is_source_port_valid()

On Mon, Oct 18, 2021 at 01:19:45AM +0900, Tsuchiya Yuto wrote:
> The function ia_css_mipi_is_source_port_valid() returns true if the port
> is valid. So, we can't use the existing err variable as is.
> 
> To fix this issue while reusing that variable, invert the return value
> when assigning it to the variable.
> 
> Fixes: 3c0538fbad9f ("media: atomisp: get rid of most checks for ISP2401 version")
> Signed-off-by: Tsuchiya Yuto <kitakar@...il.com>
> ---
>  .../staging/media/atomisp/pci/sh_css_mipi.c   | 24 ++++++++++++-------
>  1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/staging/media/atomisp/pci/sh_css_mipi.c b/drivers/staging/media/atomisp/pci/sh_css_mipi.c
> index 65fc93c5d56b..c1f2f6151c5f 100644
> --- a/drivers/staging/media/atomisp/pci/sh_css_mipi.c
> +++ b/drivers/staging/media/atomisp/pci/sh_css_mipi.c
> @@ -423,10 +423,12 @@ allocate_mipi_frames(struct ia_css_pipe *pipe,
>  		return 0; /* AM TODO: Check  */
>  	}
>  
> -	if (!IS_ISP2401)
> +	if (!IS_ISP2401) {
>  		port = (unsigned int)pipe->stream->config.source.port.port;
> -	else
> -		err = ia_css_mipi_is_source_port_valid(pipe, &port);
> +	} else {
> +		/* Returns true if port is valid. So, invert it */
> +		err = !ia_css_mipi_is_source_port_valid(pipe, &port);

Don't invert it...  This isn't supposed to return 1 on failure it's
supposed to return negative error codes.


> +	}
>  
>  	assert(port < N_CSI_PORTS);
>  
> @@ -553,10 +555,12 @@ free_mipi_frames(struct ia_css_pipe *pipe)
>  			return err;
>  		}
>  
> -		if (!IS_ISP2401)
> +		if (!IS_ISP2401) {
>  			port = (unsigned int)pipe->stream->config.source.port.port;
> -		else
> -			err = ia_css_mipi_is_source_port_valid(pipe, &port);
> +		} else {
> +			/* Returns true if port is valid. So, invert it */
> +			err = !ia_css_mipi_is_source_port_valid(pipe, &port);

Presumably the same here?

> +		}
>  
>  		assert(port < N_CSI_PORTS);
>  
> @@ -665,10 +669,12 @@ send_mipi_frames(struct ia_css_pipe *pipe)
>  		/* TODO: AM: maybe this should be returning an error. */
>  	}
>  
> -	if (!IS_ISP2401)
> +	if (!IS_ISP2401) {
>  		port = (unsigned int)pipe->stream->config.source.port.port;
> -	else
> -		err = ia_css_mipi_is_source_port_valid(pipe, &port);
> +	} else {
> +		/* Returns true if port is valid. So, invert it */
> +		err = !ia_css_mipi_is_source_port_valid(pipe, &port);

Same?

> +	}
>  
>  	assert(port < N_CSI_PORTS);

regards,
dan carpenter