Re: [PATCH 1/6] drm/dp_mst: Introduce drm_dp_mst_connector_atomic_check() (fwd)

[Julia Lawall]

Hello,

I don't think you can update the loop index variable in
list_for_each_entry, because the mcro uses th index variable to get to the
next element.  Perhaps list_for_each_entry_safe would be more suitable?

julia

---------- Forwarded message ----------
Date: Thu, 20 Sep 2018 04:30:13 +0800
From: kbuild test robot <lkp@xxxxxxxxx>
To: kbuild@xxxxxx
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Subject: Re: [PATCH 1/6] drm/dp_mst: Introduce
    drm_dp_mst_connector_atomic_check()

CC: kbuild-all@xxxxxx
In-Reply-To: <20180918230637.20700-2-lyude@xxxxxxxxxx>
References: <20180918230637.20700-2-lyude@xxxxxxxxxx>
TO: Lyude Paul <lyude@xxxxxxxxxx>
CC: dri-devel@xxxxxxxxxxxxxxxxxxxxx, nouveau@xxxxxxxxxxxxxxxxxxxxx, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx
CC: David Airlie <airlied@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx, Sean Paul <sean@xxxxxxxxxx>

Hi Lyude,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on v4.19-rc4 next-20180919]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

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
:::::: branch date: 8 hours ago
:::::: commit date: 8 hours ago

>> drivers/gpu/drm/drm_dp_mst_topology.c:3144:1-20: iterator with update on line 3145

# 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 +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) {
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

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