Linux 4.1 WARNING in drm_ioctl.c

[Fabio Coatti]

In data martedì 23 giugno 2015 08:39:47, Daniel Vetter ha scritto:
> On Mon, Jun 22, 2015 at 04:04:20PM +0200, Fabio Coatti wrote:
> > 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.)
> 
> Which drm driver are you using? I didn't spot anything in your module list
> but might have missed it. Booting with drm.debug=0xe and grabbing dmesg
> will tell us for sure.
> -Daniel

Attached the drm.debug output, grepped for "drm". Let me know if I stripped 
something useful. 

Thanks,
-- 
Fabio

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