From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp2120.oracle.com ([156.151.31.85]:60766 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731343AbeITO7R (ORCPT ); Thu, 20 Sep 2018 10:59:17 -0400 Date: Thu, 20 Sep 2018 12:16:31 +0300 From: Dan Carpenter To: kbuild@01.org, Lyude Paul 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 , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Sean Paul Subject: Re: [PATCH 1/6] drm/dp_mst: Introduce drm_dp_mst_connector_atomic_check() Message-ID: <20180920091631.dyxytd7zecbpmv64@mwanda> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180918230637.20700-2-lyude@redhat.com> Sender: stable-owner@vger.kernel.org List-ID: 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