[Bug 103347] [dp] intel_dp.c:1554 WARN_ON(len <=8)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103347

--- Comment #7 from F.Hartung <f.hartung at outlook.de> ---
I used the latest commit (https://github.com/freedesktop/drm-tip), finished my
rebuild, uploaded the image but still:

[   19.052823] ------------[ cut here ]------------
[   19.052824] WARN_ON(len <= 0)
[   19.052841] WARNING: CPU: 2 PID: 857 at drivers/gpu/drm/i915/intel_dp.c:1619
intel_dp_max_link_rate+0x55/0x70
[   19.052841] Modules linked in: 8021q wl(PO) iwlmvm mac80211 iwlwifi
snd_hda_codec_hdmi btusb btrtl btbcm btintel bluetooth snd_hda_codec_realtek
snd_usb_audio snd_hda_codec_generic snd_usbmidi_lib ecdh_generic snd_rawmidi
cfg80211 intel_powerclamp intel_rapl snd_hda_intel rfkill snd_hda_codec
snd_hda_core snd_hwdep overlay uvesafb
[   19.052860] CPU: 2 PID: 857 Comm: Xorg Tainted: P        W  O     4.16.0-rc7
#1
[   19.052861] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./J3455-ITX, BIOS P1.60 01/16/2018
[   19.052863] RIP: 0010:intel_dp_max_link_rate+0x55/0x70
[   19.052864] RSP: 0018:ffff9e5375bd7bd0 EFLAGS: 00010282
[   19.052866] RAX: 0000000000000011 RBX: ffff9e5376519000 RCX:
ffffffff8c246e58
[   19.052867] RDX: 0000000000000001 RSI: 0000000000000086 RDI:
0000000000000297
[   19.052868] RBP: 0000000000098580 R08: 0000000000001376 R09:
ffffffff8cfd6c40
[   19.052870] R10: ffffee2989d54940 R11: 0000000000000001 R12:
ffff9e5375525c00
[   19.052871] R13: 00000000000121c0 R14: 0000000000000000 R15:
ffff9e5376519108
[   19.052873] FS:  00007f82608a8d00(0000) GS:ffff9e537fd00000(0000)
knlGS:0000000000000000
[   19.052874] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.052875] CR2: 0000000001a5a2a8 CR3: 00000002743e2000 CR4:
00000000001406a0
[   19.052876] Call Trace:
[   19.052878]  intel_dp_mode_valid+0xa7/0x160
[   19.052881]  drm_helper_probe_single_connector_modes+0x3d5/0x6a0
[   19.052884]  drm_mode_getconnector+0x146/0x300
[   19.052887]  ? shmem_getpage_gfp.isra.41+0x409/0xbc0
[   19.052890]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
[   19.052891]  drm_ioctl_kernel+0x81/0xd0
[   19.052893]  drm_ioctl+0x2a8/0x350
[   19.052896]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
[   19.052898]  ? generic_file_write_iter+0xf1/0x1e0
[   19.052900]  ? __vfs_write+0xdd/0x140
[   19.052902]  do_vfs_ioctl+0x90/0x5f0
[   19.052904]  SyS_ioctl+0x3b/0x70
[   19.052907]  do_syscall_64+0x6f/0x130
[   19.052909]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[   19.052911] RIP: 0033:0x7f825f0d9767
[   19.052912] RSP: 002b:00007ffd11ca3798 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[   19.052914] RAX: ffffffffffffffda RBX: 0000000001a56cb0 RCX:
00007f825f0d9767
[   19.052915] RDX: 00007ffd11ca3820 RSI: 00000000c05064a7 RDI:
000000000000000a
[   19.052917] RBP: 00007ffd11ca3820 R08: 0000000001a56000 R09:
0000000000000001
[   19.052918] R10: 0000000000000000 R11: 0000000000000246 R12:
00000000c05064a7
[   19.052919] R13: 000000000000000a R14: 000000000000000a R15:
00007ffd11ca3820
[   19.052921] Code: 8a fc eb 10 8b 32 89 c1 48 83 ea 04 83 e8 01 41 39 f0 7d
1f 85 c0 75 ec 48 c7 c6 78 93 f9 8b 48 c7 c7 a7 a1 ef 8b e8 cb 18 6e ff <0f> 0b
b8 d0 78 02 00 c3 83 e9 01 48 63 c9 8b 44 8f 74 c3 0f 1f 
[   19.052964] WARNING: CPU: 2 PID: 857 at drivers/gpu/drm/i915/intel_dp.c:1619
intel_dp_max_link_rate+0x55/0x70
[   19.052965] ---[ end trace a187945a29a828b9 ]---

apollo:~ # uname -r
4.16.0-rc7

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