linux-kernel - RE: [PATCH][next] drm/i915/hdcp: Fix return of value in uninitialized variable ret

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Date:   Mon, 25 Jan 2021 10:20:47 +0000
From:   "Gupta, Anshuman" <anshuman.gupta@...el.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Colin King <colin.king@...onical.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "C, Ramalingam" <ramalingam.c@...el.com>,
        "Shankar, Uma" <uma.shankar@...el.com>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH][next] drm/i915/hdcp: Fix return of value in uninitialized
 variable ret

It is already merged to drm-intel-next 
https://cgit.freedesktop.org/drm/drm-intel/commit/?h=drm-intel-next&id=40a6cead28f841ac350bd38dd7260ecacd5eab03

> -----Original Message-----
> From: Jani Nikula <jani.nikula@...ux.intel.com>
> Sent: Friday, January 22, 2021 8:51 PM
> To: Colin King <colin.king@...onical.com>; Joonas Lahtinen
> <joonas.lahtinen@...ux.intel.com>; Vivi, Rodrigo <rodrigo.vivi@...el.com>;
> David Airlie <airlied@...ux.ie>; Daniel Vetter <daniel@...ll.ch>; C, Ramalingam
> <ramalingam.c@...el.com>; Gupta, Anshuman <anshuman.gupta@...el.com>;
> Shankar, Uma <uma.shankar@...el.com>; intel-gfx@...ts.freedesktop.org; dri-
> devel@...ts.freedesktop.org
> Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH][next] drm/i915/hdcp: Fix return of value in uninitialized
> variable ret
> 
> On Fri, 22 Jan 2021, Colin King <colin.king@...onical.com> wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > Currently when there are other connectors on the port using HDCP the
> > function _intel_hdcp_disable returns a garbage uninitialized value in
> > variable ret.  I believe the intention is to return 0, so return this
> > literal value instead of the value in ret.
> >
> > Addresses-Coverity: ("Uninitialized scalar return")
> > Fixes: 899c8762f981 ("drm/i915/hdcp: Configure HDCP2.2 MST steram
> > encryption status")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> 
> Thanks, but there's already a fix in progress:
> 
> http://lore.kernel.org/r/20210119064655.1605-3-anshuman.gupta@intel.com
> 
> BR,
> Jani.
> 
> 
> > ---
> >  drivers/gpu/drm/i915/display/intel_hdcp.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > index db8dff2eeb0a..a0e7b0bf892b 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > @@ -883,7 +883,7 @@ static int _intel_hdcp_disable(struct intel_connector
> *connector)
> >  	 * until it disabled HDCP encryption for all connectors in MST topology.
> >  	 */
> >  	if (dig_port->num_hdcp_streams > 0)
> > -		return ret;
> > +		return 0;
> >
> >  	hdcp->hdcp_encrypted = false;
> >  	intel_de_write(dev_priv, HDCP_CONF(dev_priv, cpu_transcoder, port),
> > 0);
> 
> --
> Jani Nikula, Intel Open Source Graphics Center