From: Dan Carpenter <dan.carpenter@oracle.com>
To: kbuild@01.org, Lyude Paul <lyude@redhat.com>
Cc: kbuild-all@01.org, dri-devel@lists.freedesktop.org,
nouveau@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
amd-gfx@lists.freedesktop.org, David Airlie <airlied@linux.ie>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Sean Paul <sean@poorly.run>
Subject: Re: [PATCH 1/6] drm/dp_mst: Introduce drm_dp_mst_connector_atomic_check()
Date: Thu, 20 Sep 2018 12:16:31 +0300 [thread overview]
Message-ID: <20180920091631.dyxytd7zecbpmv64@mwanda> (raw)
In-Reply-To: <20180918230637.20700-2-lyude@redhat.com>
Hi Lyude,
Thank you for the patch! Perhaps something to improve:
url: https://github.com/0day-ci/linux/commits/Lyude-Paul/Fix-legacy-DPMS-changes-with-MST/20180919-203434
base: git://anongit.freedesktop.org/drm-intel for-linux-next
smatch warnings:
drivers/gpu/drm/drm_dp_mst_topology.c:3144 drm_dp_mst_connector_still_exists() error: we previously assumed 'port' could be null (see line 3146)
# https://github.com/0day-ci/linux/commit/f8df31d5221b9a6da6698d4a37e622253bb17cdc
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout f8df31d5221b9a6da6698d4a37e622253bb17cdc
vim +/port +3144 drivers/gpu/drm/drm_dp_mst_topology.c
3f3353b7 Pandiyan, Dhinakaran 2017-04-20 3131
f8df31d5 Lyude Paul 2018-09-18 3132 static bool
f8df31d5 Lyude Paul 2018-09-18 3133 drm_dp_mst_connector_still_exists(struct drm_connector *connector,
f8df31d5 Lyude Paul 2018-09-18 3134 struct drm_dp_mst_topology_mgr *mgr,
f8df31d5 Lyude Paul 2018-09-18 3135 struct drm_dp_mst_branch *mstb)
f8df31d5 Lyude Paul 2018-09-18 3136 {
f8df31d5 Lyude Paul 2018-09-18 3137 struct drm_dp_mst_port *port;
f8df31d5 Lyude Paul 2018-09-18 3138 bool exists = false;
f8df31d5 Lyude Paul 2018-09-18 3139
f8df31d5 Lyude Paul 2018-09-18 3140 mstb = drm_dp_get_validated_mstb_ref(mgr, mstb);
f8df31d5 Lyude Paul 2018-09-18 3141 if (!mstb)
f8df31d5 Lyude Paul 2018-09-18 3142 return false;
f8df31d5 Lyude Paul 2018-09-18 3143
f8df31d5 Lyude Paul 2018-09-18 @3144 list_for_each_entry(port, &mstb->ports, next) {
^^^^
We need to use a different loop iterator, or possibly
list_for_each_entry_safe() because it looks like we're freeing
something. Maybe it's cleanest to do both.
f8df31d5 Lyude Paul 2018-09-18 3145 port = drm_dp_get_validated_port_ref(mgr, port);
f8df31d5 Lyude Paul 2018-09-18 @3146 if (!port)
f8df31d5 Lyude Paul 2018-09-18 3147 continue;
f8df31d5 Lyude Paul 2018-09-18 3148
f8df31d5 Lyude Paul 2018-09-18 3149 exists = (port->connector == connector ||
f8df31d5 Lyude Paul 2018-09-18 3150 (port->mstb &&
f8df31d5 Lyude Paul 2018-09-18 3151 drm_dp_mst_connector_still_exists(connector, mgr,
f8df31d5 Lyude Paul 2018-09-18 3152 port->mstb)));
f8df31d5 Lyude Paul 2018-09-18 3153
f8df31d5 Lyude Paul 2018-09-18 3154 drm_dp_put_port(port);
f8df31d5 Lyude Paul 2018-09-18 3155 if (exists)
f8df31d5 Lyude Paul 2018-09-18 3156 break;
f8df31d5 Lyude Paul 2018-09-18 3157 }
f8df31d5 Lyude Paul 2018-09-18 3158
f8df31d5 Lyude Paul 2018-09-18 3159 drm_dp_put_mst_branch_device(mstb);
f8df31d5 Lyude Paul 2018-09-18 3160 return exists;
f8df31d5 Lyude Paul 2018-09-18 3161 }
f8df31d5 Lyude Paul 2018-09-18 3162
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
next prev parent reply other threads:[~2018-09-20 9:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-18 23:06 [PATCH 0/6] Fix legacy DPMS changes with MST Lyude Paul
2018-09-18 23:06 ` [PATCH 1/6] drm/dp_mst: Introduce drm_dp_mst_connector_atomic_check() Lyude Paul
2018-09-20 9:16 ` Dan Carpenter [this message]
2018-09-20 23:35 ` Harry Wentland
2018-09-18 23:06 ` [PATCH 2/6] drm/nouveau: Unbreak nv50_mstc->best_encoder() Lyude Paul
2018-09-18 23:06 ` [PATCH 3/6] drm/i915: Leave intel_conn->mst_port set, use mst_port_gone instead Lyude Paul
2018-09-21 9:27 ` [Intel-gfx] " Daniel Vetter
2018-09-21 20:17 ` Lyude Paul
2018-09-22 8:51 ` Daniel Vetter
2018-09-18 23:06 ` [PATCH 4/6] drm/i915: Skip vcpi allocation for MSTB ports that are gone Lyude Paul
2018-09-18 23:06 ` [PATCH 5/6] drm/i915: Fix intel_dp_mst_best_encoder() Lyude Paul
2018-09-18 23:06 ` [PATCH 6/6] drm/amdgpu/dm/mst: Use drm_dp_mst_connector_atomic_check() Lyude Paul
2018-09-20 23:36 ` Harry Wentland
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