I don't think that what is done in lines 1884 and 1885 is the right approach. port is just a local variable that points to the different list elements and allows list_for_each_entry to get from one element to the other. Setting port to NULL doesn't change the list, and it makes it impossible for list_for_each_entry to find the next element.

julia

---------- Forwarded message ---------- Date: Fri, 17 Feb 2017 05:00:49 +0800 From: kbuild test robot fengguang.wu@intel.com To: kbuild@01.org Cc: Julia Lawall julia.lawall@lip6.fr Subject: [asoc:topic/intel 83/98] sound/soc/codecs/hdac_hdmi.c:1884:2-21: iterator with update on line 1885

tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git topic/intel head: e3efb2ad834b50cb9c8625155e3e2674f5bc443b commit: e0e5d3e5a53b3bc354c18030b78b7ebcb33e004b [83/98] ASoC: hdac_hdmi: Add support for multiple ports to a PCM :::::: branch date: 2 hours ago :::::: commit date: 2 hours ago

...

sound/soc/codecs/hdac_hdmi.c:1884:2-21: iterator with update on line 1885

git remote add asoc https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git git remote update asoc git checkout e0e5d3e5a53b3bc354c18030b78b7ebcb33e004b vim +1884 sound/soc/codecs/hdac_hdmi.c

18382ead Subhransu S. Prusty 2015-11-10 1878 4a3478de Jeeja KP 2016-02-12 1879 list_for_each_entry_safe(pcm, pcm_next, &hdmi->pcm_list, head) { 4a3478de Jeeja KP 2016-02-12 1880 pcm->cvt = NULL; e0e5d3e5 Jeeja KP 2017-02-07 1881 if (list_empty(&pcm->port_list)) e0e5d3e5 Jeeja KP 2017-02-07 1882 continue; e0e5d3e5 Jeeja KP 2017-02-07 1883 e0e5d3e5 Jeeja KP 2017-02-07 @1884 list_for_each_entry(port, &pcm->port_list, head) e0e5d3e5 Jeeja KP 2017-02-07 @1885 port = NULL; e0e5d3e5 Jeeja KP 2017-02-07 1886 4a3478de Jeeja KP 2016-02-12 1887 list_del(&pcm->head); 4a3478de Jeeja KP 2016-02-12 1888 kfree(pcm);

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