[Bug 99113] New: REGRESSION: WARN_ON_ONCE(!intel_dp->lane_count) [and slow path probing dp link)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99113

            Bug ID: 99113
           Summary: REGRESSION: WARN_ON_ONCE(!intel_dp->lane_count) [and
                    slow path probing dp link)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: gwhite at kupulau.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

This is on a dell Precision laptop (eDP) 5510 with 4.10 pre-rc1.  Note that
this machine has no DP connector.

Linux 4.9.0+ #122 SMP Fri Dec 16 15:09:04 EST 2016 x86_64 GNU/Linux



    1.594516] WARNING: CPU: 0 PID: 68 at drivers/gpu/drm/i915/intel_dp.c:4018
intel_dp_check_link_status+0x1b9/0x1e0
[    1.594521] WARN_ON_ONCE(!intel_dp->lane_count)
[    1.594521] Modules linked in:
[    1.594528] CPU: 0 PID: 68 Comm: kworker/u16:1 Tainted: G     U         
4.9.0-GTW2+ #122
[    1.594531] Hardware name: Dell Inc. Precision 5510/0WWKNF, BIOS 1.2.16
10/07/2016
[    1.594536] Workqueue: events_unbound async_run_entry_fn
[    1.594538] Call Trace:
[    1.594543]  dump_stack+0x86/0xc1
[    1.594545]  __warn+0xcb/0xf0
[    1.594548]  warn_slowpath_fmt+0x4f/0x60
[    1.594551]  ? drm_dp_dpcd_read+0x57/0x70
[    1.594554]  intel_dp_check_link_status+0x1b9/0x1e0
[    1.594557]  intel_dp_detect+0x620/0xa10
[    1.594559]  drm_helper_probe_single_connector_modes+0x2a3/0x500
[    1.594562]  ? load_balance+0x159/0x8b0
[    1.594566]  drm_setup_crtcs+0x7b/0x9b0
[    1.594568]  ? dequeue_entity+0x236/0xbd0
[    1.594571]  ? dequeue_task_fair+0x6eb/0xaf0
[    1.594574]  drm_fb_helper_initial_config+0x4d/0x3b0
[    1.594578]  ? __switch_to+0x263/0x3c0
[    1.594581]  intel_fbdev_initial_config+0x18/0x30
[    1.594584]  async_run_entry_fn+0x37/0x150
[    1.594588]  process_one_work+0x1f3/0x450
[    1.594592]  worker_thread+0x4b/0x510
[    1.594595]  kthread+0x101/0x140
[    1.594598]  ? process_one_work+0x450/0x450
[    1.594600]  ? kthread_create_on_node+0x40/0x40
[    1.594604]  ret_from_fork+0x2a/0x40
[    1.594608] ---[ end trace b7af2b47bfaec06e ]---
[

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