[Bug 97344] New: intel_dp WARN_ON(!msg->buffer != !msg->size)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97344

            Bug ID: 97344
           Summary: intel_dp WARN_ON(!msg->buffer != !msg->size)
           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: matthew.auld at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

No visible issues, just lots of the following dmesg-warns: 

[    2.939715] WARNING: CPU: 2 PID: 6 at drivers/gpu/drm/i915/intel_dp.c:1037
intel_dp_aux_transfer+0x1f1/0x260 [i915]
[    2.939716] WARN_ON(!msg->buffer != !msg->size)
[    2.939720] Modules linked in: i915 i2c_algo_bit drm_kms_helper
rtsx_pci_sdmmc mmc_core drm e1000e crct10dif_pclmul crc32_pclmul crc32c_intel
ptp serio_raw rtsx_pci pps_core video fjes
[    2.939721] CPU: 2 PID: 6 Comm: kworker/u16:0 Tainted: G        W      
4.8.0-rc1-drm-intel+ #61
[    2.939722] Hardware name: LENOVO 20BW000FUK/20BW000FUK, BIOS JBET54WW (1.19
) 11/06/2015
[    2.939753] Workqueue: i915-dp i915_digport_work_func [i915]
[    2.939755]  0000000000000286 00000000da108d1d ffff88023465fb80
ffffffff813dc74d
[    2.939756]  ffff88023465fbd0 0000000000000000 ffff88023465fbc0
ffffffff810a750b
[    2.939758]  0000040dda108d1d ffff88023465fca0 ffff88022b796160
ffff88022b7960e8
[    2.939758] Call Trace:
[    2.939760]  [<ffffffff813dc74d>] dump_stack+0x63/0x86
[    2.939762]  [<ffffffff810a750b>] __warn+0xcb/0xf0
[    2.939764]  [<ffffffff810a758f>] warn_slowpath_fmt+0x5f/0x80
[    2.939766]  [<ffffffff817e0919>] ?
schedule_hrtimeout_range_clock+0xb9/0x1b0
[    2.939798]  [<ffffffffa0233c21>] intel_dp_aux_transfer+0x1f1/0x260 [i915]
[    2.939802]  [<ffffffffa0152e62>] drm_dp_dpcd_access+0x72/0x120
[drm_kms_helper]
[    2.939806]  [<ffffffffa0152f2b>] drm_dp_dpcd_write+0x1b/0x20
[drm_kms_helper]
[    2.939837]  [<ffffffffa022e7b8>] intel_dp_start_link_train+0x178/0x280
[i915]
[    2.939866]  [<ffffffffa022feda>] intel_dp_check_link_status+0xba/0x110
[i915]
[    2.939896]  [<ffffffffa023670e>] intel_dp_hpd_pulse+0x1ee/0x350 [i915]
[    2.939927]  [<ffffffffa021c023>] i915_digport_work_func+0x93/0x110 [i915]
[    2.939928]  [<ffffffff810c0824>] process_one_work+0x184/0x410
[    2.939929]  [<ffffffff810c0afe>] worker_thread+0x4e/0x480
[    2.939931]  [<ffffffff810c0ab0>] ? process_one_work+0x410/0x410
[    2.939932]  [<ffffffff810c6618>] kthread+0xd8/0xf0
[    2.939934]  [<ffffffff817e18bf>] ret_from_fork+0x1f/0x40
[    2.939936]  [<ffffffff810c6540>] ? kthread_worker_fn+0x180/0x180
[    2.939937] ---[ end trace 5ae7a222f3deeff8 ]---

And a little bit more info:

msg->buffer != null, msg->size = 0, intel_dp->lane_count = 0

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