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:   Mon, 8 Nov 2021 18:14:55 +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 Tue, Nov 09, 2021 at 12:00:29AM +0900, Tsuchiya Yuto wrote:
> On Tue, 2021-11-02 at 14:33 +0300, Dan Carpenter wrote:
> > 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.
> 
> You mean I should instead modify the return value of
> ia_css_mipi_is_source_port_valid() ?
> 

No.  ia_css_mipi_is_source_port_valid() is fine.  It has a boolean name
so returning bool is fine.  What I'm saying is that allocate_mipi_frames()
should do:

	if (!ia_css_mipi_is_source_port_valid(pipe, &port))
		err = -EINVAL;

Otherwise it returns negative error codes and 1 on failure.

regards,
dan carpenter