linux-kernel - [i915] WARN_ON_ONCE(!intel_dp->lane

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Date:   Thu, 15 Dec 2016 07:07:44 +0100
From:   Mike Galbraith <umgwanakikbuti@...il.com>
To:     Matthew Auld <matthew.auld@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [i915] WARN_ON_ONCE(!intel_dp->lane_count)

There's a FIXME there, but seems you may still want to hear about it,
so here ya go.


[    4.481803] [drm] Initialized
[    4.600103] [drm] Memory usable by graphics device = 4096M
[    4.600108] checking generic (c0000000 1d5000) vs hw (c0000000 10000000)
[    4.600109] fb: switching to inteldrmfb from EFI VGA
[    4.600200] Console: switching to colour dummy device 80x25
[    4.601073] [drm] Replacing VGA console driver
[    4.607781] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    4.607783] [drm] Driver supports precise vblank timestamp query.
[    4.611373] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    4.613393] [drm] Finished loading i915/skl_dmc_ver1_26.bin (v1.26)
[    4.645242] [drm] GuC firmware load skipped
[    4.652382] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[    4.653127] random: crng init done
[    4.653637] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6
[    4.654286] [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on minor 0
[    4.666657] ------------[ cut here ]------------
[    4.666698] WARNING: CPU: 1 PID: 487 at drivers/gpu/drm/i915/intel_dp.c:4018 intel_dp_check_link_status+0x1d3/0x1e0 [i915]
[    4.666699] WARN_ON_ONCE(!intel_dp->lane_count)
[    4.666700] Modules linked in:
[    4.666701]  rtsx_pci_sdmmc(E) mmc_core(E) ahci(E) libahci(E) rtsx_pci(E) mfd_core(E) libata(E) xhci_pci(E) i915(E) xhci_hcd(E) usbcore(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) drm(E) video(E) button(E) fjes(E) af_packet(E) sd_mod(E) vfat(E) fat(E) virtio_blk(E) virtio_mmio(E) virtio_pci(E) virtio_ring(E) virtio(E) ext4(E) crc16(E) jbd2(E) mbcache(E) dm_mod(E) loop(E) sg(E) scsi_mod(E) autofs4(E)
[    4.666727] CPU: 1 PID: 487 Comm: kworker/u8:3 Tainted: G            E   4.10.0-preempt #1
[    4.666728] Hardware name: HP HP Spectre x360 Convertible/804F, BIOS F.31 01/15/2016
[    4.666731] Workqueue: events_unbound async_run_entry_fn
[    4.666732] Call Trace:
[    4.666736]  dump_stack+0x85/0xc9
[    4.666738]  __warn+0xd1/0xf0
[    4.666740]  warn_slowpath_fmt+0x4f/0x60
[    4.666746]  ? drm_dp_dpcd_read+0x57/0x70 [drm_kms_helper]
[    4.666774]  intel_dp_check_link_status+0x1d3/0x1e0 [i915]
[    4.666799]  intel_dp_detect+0x5a8/0x950 [i915]
[    4.666803]  drm_helper_probe_single_connector_modes+0x296/0x4d0 [drm_kms_helper]
[    4.666807]  drm_setup_crtcs+0x8a/0xc70 [drm_kms_helper]
[    4.666815]  ? mutex_lock_nested+0xad/0x6a0
[    4.666819]  ? drm_fb_helper_initial_config+0x47/0x3f0 [drm_kms_helper]
[    4.666823]  drm_fb_helper_initial_config+0x5b/0x3f0 [drm_kms_helper]
[    4.666847]  intel_fbdev_initial_config+0x18/0x30 [i915]
[    4.666849]  async_run_entry_fn+0x39/0x170
[    4.666850]  process_one_work+0x1e1/0x6b0
[    4.666851]  ? process_one_work+0x162/0x6b0
[    4.666853]  worker_thread+0x137/0x4b0
[    4.666855]  kthread+0x10c/0x140
[    4.666856]  ? process_one_work+0x6b0/0x6b0
[    4.666857]  ? kthread_parkme+0x40/0x40
[    4.666859]  ret_from_fork+0x2a/0x40
[    4.666861] ---[ end trace b9510d991aa51e41 ]---
[    4.686370] fbcon: inteldrmfb (fb0) is primary device