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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Focal)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1908885
Title:
Fix drm_WARN_ON(common_len <= 0)
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
New
Status in linux source package in Focal:
Incomplete
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
New
Bug description:
[Impact]
The TGL machine could show drm_WARN_ON(common_len <= 0) when connect with the
TBT dock(WD19TB).
------------[ cut here ]------------
i915 0000:00:02.0: drm_WARN_ON(common_len <= 0)
WARNING: CPU: 4 PID: 194 at drivers/gpu/drm/i915/display/intel_dp.c:2385
intel_dp_compute_link_config+0x820/0x900 [i915]
Modules linked in: i915(+) i2c_algo_bit drm_kms_helper crc32_pclmul
syscopyarea sysfillrect sysimgblt fb_sys_fops cec rc_core nvme e1000e(+) c_i801
ahci i2c_smbus
thunderbolt(+) xhci_pci xhci_pci_renesas wmi video backlight
pinctrl_tigerlake pinctrl_intel
CPU: 4 PID: 194 Comm: systemd-udevd Not tainted 5.10.0-051000rc7-generic
#202012062330
Hardware name: Dell Inc. OptiPlex 7090 UFF - China HDD Protection/, BIOS
0.6.4 11/07/2020
RIP: 0010:intel_dp_compute_link_config+0x820/0x900 [i915]
Code: 4c 8b 77 50 4d 85 f6 75 03 4c 8b 37 e8 b9 b9 60 dc 48 c7 c1 b5 6d 83 c0
4c 89 f2 48 c7 c7 d0 69 83 c0 48 89 c6 e8 a5 84 f2 db <0f> 0b ff e9 60 f8 ff ff
48 8b
c2 60 04 82
RSP: 0018:ffffba120061f6b0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff956df17c2000 RCX: 0000000000000000
RDX: 000000000000002f RSI: ffffffff9e1b1dcf RDI: 0000000000000246
RBP: ffffba120061f720 R08: ffffffff9e1b1da0 R09: 000000000000002f
R10: ffffffff9e1b2180 R11: 000000009e1b1db2 R12: ffff956df1e40000
R13: ffff956df17c6000 R14: ffff956e029a99e0 R15: ffff956df17c6000
FS: 00007fbd08cdd880(0000) GS:ffff956e0e500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005635d4c41678 CR3: 0000000271c64006 CR4: 0000000000770ee0
PKRU: 55555554
Call Trace:
? dev_printk+0x5d/0x74
intel_dp_compute_config+0x11b/0x570 [i915]
intel_ddi_compute_config+0x9f/0xe0 [i915]
intel_modeset_pipe_config+0x212/0x9c0 [i915]
intel_atomic_check+0x263/0x12c0 [i915]
? __drm_dbg+0x87/0x90 [drm]
drm_atomic_check_only+0x2c7/0x450 [drm]
drm_atomic_commit+0x18/0x50 [drm]
intel_modeset_init_nogem+0x486/0xb10 [i915]
i915_driver_probe+0x3e8/0x6e0 [i915]
? mutex_lock+0x13/0x40
i915_pci_probe+0x5a/0x140 [i915]
local_pci_probe+0x48/0x80
pci_device_probe+0x10f/0x1c0
really_probe+0x1db/0x440
driver_probe_device+0xe9/0x160
device_driver_attach+0x5d/0x70
__driver_attach+0x8f/0x150
? device_driver_attach+0x70/0x70
bus_for_each_dev+0x7e/0xc0
driver_attach+0x1e/0x20
bus_add_driver+0x152/0x1f0
driver_register+0x74/0xd0
__pci_register_driver+0x54/0x60
i915_init+0x61/0x75 [i915]
? 0xffffffffc08a1000
do_one_initcall+0x4a/0x1fa
? _cond_resched+0x19/0x30
? kmem_cache_alloc_trace+0x17e/0x2f0
do_init_module+0x62/0x240
load_module+0xfbe/0x11e0
__do_sys_finit_module+0xbe/0x120
? __do_sys_finit_module+0xbe/0x120
__x64_sys_finit_module+0x1a/0x20
do_syscall_64+0x38/0x90
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fbd0925f89d
Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48
89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 73 01 c3 48 8b 0d
c3 f5 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007fffa60dc628 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 00005635d4c942b0 RCX: 00007fbd0925f89d
RDX: 0000000000000000 RSI: 00007fbd0913cded RDI: 0000000000000014
RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000014 R11: 0000000000000246 R12: 00007fbd0913cded
R13: 0000000000000000 R14: 00005635d4c92b70 R15: 00005635d4c942b0
---[ end trace c48f367c543f3384 ]-—
[Fix]
Kernel driver patchset https://patchwork.freedesktop.org/series/82173/
targeting v5.11.
[Test Case]
1. Boot with kernel built with these patches applied.
2. check the dmesg.
[Where problems could occur]
The fix could resolve the drm_WARN_ON.
It ease the symptom that can't output the video with the TBT dock(WD19TB) at
the first boot, but it may not fix.
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