Regression: 6eb0233ec2d0 ("usb: don't inherity DMA properties for USB devices")

Thu Feb 18 14:56:00 UTC 2021

Hi,

commit 6eb0233ec2d0 ("usb: don't inherity DMA properties for USB 
devices") creates a regression with the udl driver. udl is a DRM driver 
for USB-based DisplayLink adapters.

It's no long possible to join/mirror displays in X. STR and an error log 
is shown below.

STR:
	* use internal GFX card (radeon, i915)
	* attach udl adapter
	* start Gnome/x11 via startx
	* try to configure joined/mirrored screens

Expected Result:
	* both adapters show the Gnome desktop

Actual result:
	* the udl-driven display remains dark
	* error in the dmesg log

I only have udl devices, but I expect that other DRM USB adapters are 
also affected.

How to fix this?

Best regards
Thomas

[   60.050199] ------------[ cut here ]------------
[   60.055092] WARNING: CPU: 0 PID: 1403 at kernel/dma/mapping.c:190 
dma_map_sg_attrs+0x8f/0xc0
[   60.064331] Modules linked in: af_packet(E) rfkill(E) dmi_sysfs(E) 
intel_rapl_msr(E) intel_rapl_common(E) snd_hda_codec_realtek(E) 
snd_hda_codec_generic(E) ledtrig_audio(E) snd_hda_codec_hdmi(E) 
x86_pkg_temp_thermal(E) intel_powerclam)
[   60.064801]  wmi(E) video(E) btrfs(E) blake2b_generic(E) libcrc32c(E) 
crc32c_intel(E) xor(E) raid6_pq(E) sg(E) dm_multipath(E) dm_mod(E) 
scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) msr(E) efivarfs(E)
[   60.170778] CPU: 0 PID: 1403 Comm: Xorg.bin Tainted: G            E 
    5.11.0-rc5-1-default+ #747
[   60.179841] Hardware name: Dell Inc. OptiPlex 9020/0N4YC8, BIOS A24 
10/24/2018
[   60.187145] RIP: 0010:dma_map_sg_attrs+0x8f/0xc0
[   60.191822] Code: 4d 85 ff 75 2b 49 89 d8 44 89 e1 44 89 f2 4c 89 ee 
48 89 ef e8 62 30 00 00 85 c0 78 36 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 
0b <0f> 0b 31 c0 eb ed 49 8d 7f 50 e8 72 f5 2a 00 49 8b 47 50 49 89 d8
[   60.210770] RSP: 0018:ffffc90001d6fc18 EFLAGS: 00010246
[   60.216062] RAX: 0000000000000000 RBX: 0000000000000020 RCX: 
ffffffffb31e677b
[   60.223274] RDX: dffffc0000000000 RSI: ffff888212c10600 RDI: 
ffff8881b08a9488
[   60.230501] RBP: ffff8881b08a9030 R08: 0000000000000020 R09: 
ffff888212c10600
[   60.237710] R10: ffffed10425820df R11: 0000000000000001 R12: 
0000000000000000
[   60.244939] R13: ffff888212c10600 R14: 0000000000000008 R15: 
0000000000000000
[   60.252155] FS:  00007f08ac2b2f00(0000) GS:ffff8887cbe00000(0000) 
knlGS:0000000000000000
[   60.260333] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   60.266150] CR2: 000055831c899be8 CR3: 000000015372e006 CR4: 
00000000001706f0
[   60.273369] Call Trace:
[   60.275845]  drm_gem_map_dma_buf+0xb4/0x120
[   60.280089]  dma_buf_map_attachment+0x15d/0x1e0
[   60.284688]  drm_gem_prime_import_dev.part.0+0x5d/0x140
[   60.289984]  drm_gem_prime_fd_to_handle+0x213/0x280
[   60.294931]  ? drm_prime_destroy_file_private+0x30/0x30
[   60.300224]  drm_ioctl_kernel+0x131/0x180
[   60.304291]  ? drm_setversion+0x230/0x230
[   60.308366]  ? drm_prime_destroy_file_private+0x30/0x30
[   60.313659]  drm_ioctl+0x2f1/0x500
[   60.317118]  ? drm_version+0x150/0x150
[   60.320903]  ? lock_downgrade+0xa0/0xa0
[   60.324806]  ? do_vfs_ioctl+0x5f4/0x680
[   60.328694]  ? __fget_files+0x13e/0x210
[   60.332591]  ? ioctl_fiemap.isra.0+0x1a0/0x1a0
[   60.337102]  ? __fget_files+0x15d/0x210
[   60.340990]  __x64_sys_ioctl+0xb9/0xf0
[   60.344795]  do_syscall_64+0x33/0x80
[   60.348427]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   60.353542] RIP: 0033:0x7f08ac7b53cb
[   60.357168] Code: 89 d8 49 8d 3c 1c 48 f7 d8 49 39 c4 72 b5 e8 1c ff 
ff ff 85 c0 78 ba 4c 89 e0 5b 5d 41 5c c3 f3 0f 1e fa b8 10 00 00 00 0f 
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 75 ba 0c 00 f7 d8 64 89 01 48
[   60.376108] RSP: 002b:00007ffeabc89fc8 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
[   60.383758] RAX: ffffffffffffffda RBX: 00007ffeabc8a00c RCX: 
00007f08ac7b53cb
[   60.390970] RDX: 00007ffeabc8a00c RSI: 00000000c00c642e RDI: 
000000000000000d
[   60.398221] RBP: 00000000c00c642e R08: 000055831c691d00 R09: 
000055831b2ec010
[   60.405446] R10: 00007f08acf6ada0 R11: 0000000000000246 R12: 
000055831c691d00
[   60.412667] R13: 000000000000000d R14: 00000000007e9000 R15: 
0000000000000000
[   60.419903] irq event stamp: 672893
[   60.423441] hardirqs last  enabled at (672913): [<ffffffffb31b796d>] 
console_unlock+0x44d/0x500
[   60.432230] hardirqs last disabled at (672922): [<ffffffffb31b7963>] 
console_unlock+0x443/0x500
[   60.441021] softirqs last  enabled at (672940): [<ffffffffb46003dd>] 
__do_softirq+0x3dd/0x554
[   60.449634] softirqs last disabled at (672931): [<ffffffffb44010f2>] 
asm_call_irq_on_stack+0x12/0x20
[   60.458871] ---[ end trace f2f88696eb17806c ]---

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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