Additional info: reporter: libreport-2.6.3 WARNING: CPU: 0 PID: 23372 at include/drm/drm_crtc.h:1577 drm_helper_choose_encoder_dpms+0x8a/0x90 [drm_kms_helper]() Modules linked in: cfg80211 dm_crypt rfcomm fuse cmac xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_broute bridge stp llc ebtable_filter ebtable_nat ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_security ip6table_mangle ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_security iptable_mangle iptable_raw bnep kvm_amd kvm btusb btrtl crct10dif_pclmul btbcm crc32_pclmul btintel bluetooth eeepc_wmi asus_wmi sparse_keymap rfkill joydev snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel k10temp fam15h_power snd_hda_codec snd_hda_core edac_mce_amd snd_hwdep shpchp edac_core snd_seq snd_seq_device i2c_piix4 snd_pcm wmi snd_timer snd video acpi_cpufreq tpm_tis soundcore tpm hid_roccat_ryos hid_roccat_koneplus hid_roccat hid_roccat_common btrfs xor amdkfd amd_iommu_v2 radeon raid6_pq crc32c_intel i2c_algo_bit drm_kms_helper r8169 ttm serio_raw mii drm uas usb_storage fjes nct6775 hwmon_vid CPU: 0 PID: 23372 Comm: kworker/0:1 Not tainted 4.3.4-300.fc23.x86_64 #1 Hardware name: System manufacturer System Product Name/A88X-PRO, BIOS 2301 11/03/2015 Workqueue: events radeon_dp_work_func [radeon] 0000000000000000 000000008afbba8f ffff880013c5bd28 ffffffff813a625f 0000000000000000 ffff880013c5bd60 ffffffff810a07c2 ffff880409134800 ffff880409221600 ffff8804076af000 0000000000000003 ffff88040881e4b8 Call Trace: [<ffffffff813a625f>] dump_stack+0x44/0x55 [<ffffffff810a07c2>] warn_slowpath_common+0x82/0xc0 [<ffffffff810a090a>] warn_slowpath_null+0x1a/0x20 [<ffffffffa00f32ca>] drm_helper_choose_encoder_dpms+0x8a/0x90 [drm_kms_helper] [<ffffffffa00f33bb>] drm_helper_connector_dpms+0x4b/0x100 [drm_kms_helper] [<ffffffffa0156557>] radeon_connector_hotplug+0xf7/0x100 [radeon] [<ffffffffa016496f>] radeon_dp_work_func+0x3f/0x60 [radeon] [<ffffffff810b8cde>] process_one_work+0x19e/0x3f0 [<ffffffff810b8f7e>] worker_thread+0x4e/0x450 [<ffffffff8177d161>] ? __schedule+0x371/0x980 [<ffffffff810b8f30>] ? process_one_work+0x3f0/0x3f0 [<ffffffff810b8f30>] ? process_one_work+0x3f0/0x3f0 [<ffffffff810bede8>] kthread+0xd8/0xf0 [<ffffffff810bed10>] ? kthread_worker_fn+0x160/0x160 [<ffffffff81781b9f>] ret_from_fork+0x3f/0x70 [<ffffffff810bed10>] ? kthread_worker_fn+0x160/0x160
Created attachment 1121637 [details] File: dmesg
Created attachment 1138358 [details] Protect call to drm_helper_connector_dpms by mutexes
I took kernel 4.5-rc7 + git checkout f414ca6. Made and applied proposed patch. Tested several suspend - resume cycles and so far I were not able to reproduce above mentioned warning. Also messages: [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed: 5 tries [drm:radeon_dp_link_train [radeon]] *ERROR* channel eq failed seems to be gone. Thanks to Ben Skeggs in inspiring me into this achievement! https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/gpu/drm/nouveau/nouveau_connector.c?id=0a882cad
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