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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - intel_dp WARN_ON(!msg->buffer != !msg->size)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97344">97344</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>intel_dp WARN_ON(!msg->buffer != !msg->size)
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>matthew.auld@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>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</pre>
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