linux-kernel - Re: [PATCH] media: omap3isp: fix uninitialized variable use

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Date:   Wed, 23 Aug 2017 17:35:34 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Pavel Machek <pavel@....cz>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: omap3isp: fix uninitialized variable use

Hi,

On Wed, Aug 23, 2017 at 04:58:27PM +0300, Sakari Ailus wrote:
> On Wed, Aug 23, 2017 at 03:30:19PM +0200, Arnd Bergmann wrote:
> > A debug printk statement was copied incorrectly into the new
> > csi1 parser code and causes a warning there:
> > 
> > drivers/media/platform/omap3isp/isp.c: In function 'isp_probe':
> > include/linux/dynamic_debug.h:134:3: error: 'i' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> > 
> > Since there is only one lane, the index is never set. This
> > changes the debug print to always print a zero instead,
> > keeping the original format of the message.
> > 
> > Fixes: 9211434bad30 ("media: omap3isp: Parse CSI1 configuration from the device tree")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> >  drivers/media/platform/omap3isp/isp.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
> > index 83aea08b832d..30c825bf80d9 100644
> > --- a/drivers/media/platform/omap3isp/isp.c
> > +++ b/drivers/media/platform/omap3isp/isp.c
> > @@ -2092,7 +2092,7 @@ static int isp_fwnode_parse(struct device *dev, struct fwnode_handle *fwnode,
> >  			buscfg->bus.ccp2.lanecfg.data[0].pol =
> >  				vep.bus.mipi_csi1.lane_polarity[1];
> >  
> > -			dev_dbg(dev, "data lane %u polarity %u, pos %u\n", i,
> > +			dev_dbg(dev, "data lane 0 polarity %u, pos %u\n",
> >  				buscfg->bus.ccp2.lanecfg.data[0].pol,
> >  				buscfg->bus.ccp2.lanecfg.data[0].pos);
> >  
> 
> Thanks! I removed "0 "; CCP2 always has a single lane. The patch is now:
> 
> diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
> index 83aea08b832d..1a428fe9f070 100644
> --- a/drivers/media/platform/omap3isp/isp.c
> +++ b/drivers/media/platform/omap3isp/isp.c
> @@ -2092,7 +2092,7 @@ static int isp_fwnode_parse(struct device *dev, struct fwnode_handle *fwnode,
>  			buscfg->bus.ccp2.lanecfg.data[0].pol =
>  				vep.bus.mipi_csi1.lane_polarity[1];
>  
> -			dev_dbg(dev, "data lane %u polarity %u, pos %u\n", i,
> +			dev_dbg(dev, "data lane polarity %u, pos %u\n",
>  				buscfg->bus.ccp2.lanecfg.data[0].pol,
>  				buscfg->bus.ccp2.lanecfg.data[0].pos);

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>

-- Sebastian

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