Linux 4.1 WARNING in drm_ioctl.c

[Fabio Coatti]

Hi All,

just compiled 4.1 and just got this warning, twice, in my dmesg:


[lun giu 22 11:43:18 2015] ------------[ cut here ]------------
[lun giu 22 11:43:18 2015] WARNING: CPU: 1 PID: 2184 at 
drivers/gpu/drm/drm_ioctl.c:144 drm_setversion+0xe1/0x179()
[lun giu 22 11:43:18 2015] No drm_driver.set_busid() implementation provided 
by 0xffffffff81ec3980. Use drm_dev_set_unique() to set the unique name 
explicitly.
[lun giu 22 11:43:18 2015] Modules linked in:
[lun giu 22 11:43:18 2015]  bnep algif_skcipher cdc_wdm cdc_acm uvcvideo 
videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev btusb 
btbcm btintel bluetooth hp_wmi sparse_keymap intel_rapl iosf_mbi 
x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_hdmi coretemp kvm_intel 
kvm snd_hda_codec_generic crct10dif_pclmul crc32_pclmul snd_hda_intel iwldvm 
snd_hda_controller snd_hda_codec snd_hwdep psmouse snd_hda_core iwlwifi 
snd_pcm snd_timer snd soundcore wmi hp_accel(+) hp_wireless lis3lv02d 
sch_fq_codel dm_zero dm_persistent_data dm_service_time dm_round_robin 
dm_queue_length dm_multipath dm_delay virtio_pci virtio_blk virtio_balloon 
virtio_ring virtio fuse overlay linear raid0 dm_raid dm_snapshot dm_bufio 
dm_mirror dm_region_hash dm_log ohci_pci ohci_hcd uhci_hcd
[lun giu 22 11:43:18 2015] CPU: 1 PID: 2184 Comm: X Tainted: G        W       
4.1.0 #1
[lun giu 22 11:43:18 2015] Hardware name: Hewlett-Packard HP EliteBook Folio 
9470m/18DF, BIOS 68IBD Ver. F.40 02/01/2013
[lun giu 22 11:43:18 2015]  0000000000000000 0000000000000009 ffffffff818d8bfd 
ffff8800b226fd38
[lun giu 22 11:43:18 2015]  ffffffff810c5426 ffff880235437240 ffffffff8152870c 
ffff8800b2f16000
[lun giu 22 11:43:18 2015]  ffff880234ffc000 ffff8800b226fdf0 ffff8800b2c8f300 
00000000c0106407
[lun giu 22 11:43:18 2015] Call Trace:
[lun giu 22 11:43:18 2015]  [<ffffffff818d8bfd>] ? dump_stack+0x47/0x67
[lun giu 22 11:43:18 2015]  [<ffffffff810c5426>] ? 
warn_slowpath_common+0x9d/0xb5
[lun giu 22 11:43:18 2015]  [<ffffffff8152870c>] ? drm_setversion+0xe1/0x179
[lun giu 22 11:43:18 2015]  [<ffffffff810c5488>] ? warn_slowpath_fmt+0x4a/0x4f
[lun giu 22 11:43:18 2015]  [<ffffffff8152870c>] ? drm_setversion+0xe1/0x179
[lun giu 22 11:43:18 2015]  [<ffffffff81528465>] ? drm_ioctl+0x376/0x3dd
[lun giu 22 11:43:18 2015]  [<ffffffff8152862b>] ? drm_version+0x8d/0x8d
[lun giu 22 11:43:18 2015]  [<ffffffff811ca766>] ? do_filp_open+0x30/0x74
[lun giu 22 11:43:18 2015]  [<ffffffff811cc591>] ? do_vfs_ioctl+0x379/0x431
[lun giu 22 11:43:18 2015]  [<ffffffff811d4784>] ? __fd_install+0x20/0x52
[lun giu 22 11:43:18 2015]  [<ffffffff811bccab>] ? do_sys_open+0x1c0/0x1d2
[lun giu 22 11:43:18 2015]  [<ffffffff811cc687>] ? SyS_ioctl+0x3e/0x5a
[lun giu 22 11:43:18 2015]  [<ffffffff818e0d9b>] ? 
system_call_fastpath+0x16/0x6e
[lun giu 22 11:43:18 2015] ---[ end trace 46364eedd82ef148 ]---

It does not seems to affect normal behaviour, but maybe the report could be 
interesting for maintainers.

Sorry if this has already been reported; if more information is needed just 
let me know (please CC: me as I'm not subscribed to lists.)

Many thanks.

-- 
Fabio