From: Lyude Paul <lyude@redhat.com>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
Dave Airlie <airlied@gmail.com>,
Harry Wentland <harry.wentland@amd.com>,
Jerry Zuo <Jerry.Zuo@amd.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
David Airlie <airlied@linux.ie>,
linux-kernel@vger.kernel.org
Subject: Re: [WIP PATCH 06/15] drm/i915: Keep malloc references to MST ports
Date: Tue, 18 Dec 2018 16:52:24 -0500 [thread overview]
Message-ID: <ed0fbbed2a856e62134baa7ee88023d07f02f73c.camel@redhat.com> (raw)
In-Reply-To: <20181214093255.GO21184@phenom.ffwll.local>
On Fri, 2018-12-14 at 10:32 +0100, Daniel Vetter wrote:
> On Thu, Dec 13, 2018 at 08:25:35PM -0500, Lyude Paul wrote:
> > So that the ports stay around until we've destroyed the connectors, in
> > order to ensure that we don't pass an invalid pointer to any MST helpers
> > once we introduce the new MST VCPI helpers.
> >
> > Signed-off-by: Lyude Paul <lyude@redhat.com>
> > ---
> > drivers/gpu/drm/i915/intel_connector.c | 4 ++++
> > drivers/gpu/drm/i915/intel_dp_mst.c | 2 ++
> > 2 files changed, 6 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_connector.c
> > b/drivers/gpu/drm/i915/intel_connector.c
> > index 18e370f607bc..37d2c644f4b8 100644
> > --- a/drivers/gpu/drm/i915/intel_connector.c
> > +++ b/drivers/gpu/drm/i915/intel_connector.c
> > @@ -95,6 +95,10 @@ void intel_connector_destroy(struct drm_connector
> > *connector)
> > intel_panel_fini(&intel_connector->panel);
> >
> > drm_connector_cleanup(connector);
> > +
> > + if (intel_connector->port)
>
> We set this as the first thing in intel_dp_add_mst_connector, so this
> check isn't doing anything.
I think this comment might be a mistake? intel_connector_destroy() is shared
by all of the intel connectors, so some may not have a value in
intel_connector->port. I can move it to it's own destroy callback for MST if
you would prefer though.
>
> > + drm_dp_mst_put_port_malloc(intel_connector->port);
> > +
> > kfree(connector);
> > }
> >
> > diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c
> > b/drivers/gpu/drm/i915/intel_dp_mst.c
> > index f05427b74e34..4d6ced34d465 100644
> > --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> > @@ -484,6 +484,8 @@ static struct drm_connector
> > *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
> > if (ret)
> > goto err;
> >
> > + drm_dp_mst_get_port_malloc(port);
>
> Needs to be moved up where we assing intel_connector->port, or it'll
> underflow on cleanup on error paths.
>
> > +
> > return connector;
> >
> > err:
> > --
> > 2.19.2
> >
--
Cheers,
Lyude Paul
next prev parent reply other threads:[~2018-12-18 21:52 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-14 1:25 [WIP PATCH 00/15] MST refcounting/atomic helpers cleanup Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 01/15] drm/dp_mst: Remove bogus conditional in drm_dp_update_payload_part1() Lyude Paul
2018-12-14 8:42 ` Daniel Vetter
2018-12-17 20:09 ` Wentland, Harry
2018-12-14 1:25 ` [WIP PATCH 02/15] drm/dp_mst: Refactor drm_dp_update_payload_part1() Lyude Paul
2018-12-14 8:47 ` Daniel Vetter
2018-12-17 20:27 ` Wentland, Harry
2018-12-14 1:25 ` [WIP PATCH 03/15] drm/dp_mst: Introduce new refcounting scheme for mstbs and ports Lyude Paul
2018-12-14 9:29 ` Daniel Vetter
2018-12-18 21:27 ` Lyude Paul
2018-12-19 12:48 ` Daniel Vetter
2018-12-19 18:36 ` Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 04/15] drm/dp_mst: Stop releasing VCPI when removing ports from topology Lyude Paul
2018-12-14 9:40 ` Daniel Vetter
2018-12-14 1:25 ` [WIP PATCH 05/15] drm/dp_mst: Fix payload deallocation on hotplugs using malloc refs Lyude Paul
2018-12-14 9:38 ` Daniel Vetter
2018-12-18 22:02 ` Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 06/15] drm/i915: Keep malloc references to MST ports Lyude Paul
2018-12-14 9:32 ` Daniel Vetter
2018-12-18 21:52 ` Lyude Paul [this message]
2018-12-19 13:20 ` Daniel Vetter
2018-12-14 1:25 ` [WIP PATCH 07/15] drm/nouveau: Remove bogus cleanup in nv50_mstm_add_connector() Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 08/15] drm/nouveau: Remove unnecessary VCPI checks in nv50_msto_cleanup() Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 09/15] drm/nouveau: Fix potential use-after-frees for MSTCs Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 10/15] drm/nouveau: Stop unsetting mstc->port, use malloc refs Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 11/15] drm/nouveau: Grab payload lock in nv50_msto_payload() Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 12/15] drm/dp_mst: Add some atomic state iterator macros Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 13/15] drm/dp_mst: Start tracking per-port VCPI allocations Lyude Paul
2018-12-14 16:37 ` Daniel Vetter
2018-12-14 1:25 ` [WIP PATCH 14/15] drm/dp_mst: Check payload count in drm_dp_mst_atomic_check() Lyude Paul
2018-12-14 1:25 ` [WIP PATCH 15/15] drm/nouveau: Use atomic VCPI helpers for MST Lyude Paul
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