[Bug 97343] gem cancel_userptr warning

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97343

--- Comment #2 from mwa <matthew.auld at intel.com> ---
[  136.189244] WARNING: CPU: 2 PID: 113 at
drivers/gpu/drm/i915/i915_gem_userptr.c:94 cancel_userptr+0x208/0x250 [i915]
[  136.189245] Failed to release pages: bind_count=1, pages_pin_count=1,
pin_display=0
[  136.189245] Modules linked in: rfcomm fuse xt_CHECKSUM ipt_MASQUERADE
nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast
ip6t_REJECT nf_reject_ipv6 ip6t_rpfilter xt_conntrack ip_set nfnetlink
ebtable_broute bridge stp llc ebtable_nat ip6table_security ip6table_mangle
ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_raw
iptable_security iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack iptable_raw ebtable_filter ebtables
ip6table_filter ip6_tables cmac bnep arc4 iwlmvm mac80211 iTCO_wdt
iTCO_vendor_support uvcvideo iwlwifi intel_rapl x86_pkg_temp_thermal coretemp
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 snd_hda_codec_realtek
videobuf2_core snd_hda_codec_hdmi snd_hda_codec_generic videodev cfg80211
snd_hda_intel
[  136.189271]  btusb snd_hda_codec btrtl media joydev btbcm snd_hwdep
rtsx_pci_ms snd_hda_core btintel memstick bluetooth nfsd snd_seq thinkpad_acpi
wmi snd_seq_device rfkill snd_pcm auth_rpcgss intel_rst snd_timer nfs_acl snd
mei_me lockd mei tpm_tis shpchp i2c_i801 lpc_ich tpm_tis_core intel_pch_thermal
soundcore tpm i2c_smbus grace sunrpc dm_crypt hid_microsoft i915 i2c_algo_bit
drm_kms_helper rtsx_pci_sdmmc mmc_core drm e1000e crct10dif_pclmul crc32_pclmul
crc32c_intel ptp serio_raw rtsx_pci pps_core fjes video
[  136.189294] CPU: 2 PID: 113 Comm: kworker/u16:3 Tainted: G        W      
4.8.0-rc1-drm-intel+ #62
[  136.189295] Hardware name: LENOVO 20BW000FUK/20BW000FUK, BIOS JBET54WW (1.19
) 11/06/2015
[  136.189312] Workqueue: i915-userptr-release cancel_userptr [i915]
[  136.189313]  0000000000000286 0000000052dfdf5c ffff88022ba13d20
ffffffff813dcf2d
[  136.189315]  ffff88022ba13d70 0000000000000000 ffff88022ba13d60
ffffffff810a750b
[  136.189316]  0000005e3dc99538 ffff880228e70068 ffff8801afb68f00
ffffffff81552000
[  136.189318] Call Trace:
[  136.189321]  [<ffffffff813dcf2d>] dump_stack+0x63/0x86
[  136.189324]  [<ffffffff810a750b>] __warn+0xcb/0xf0
[  136.189325]  [<ffffffff81552000>] ? fence_wait_timeout.part.9+0xc0/0xc0
[  136.189327]  [<ffffffff810a758f>] warn_slowpath_fmt+0x5f/0x80
[  136.189340]  [<ffffffffa01e71b8>] cancel_userptr+0x208/0x250 [i915]
[  136.189342]  [<ffffffff810c0824>] process_one_work+0x184/0x410
[  136.189343]  [<ffffffff810c0afe>] worker_thread+0x4e/0x480
[  136.189344]  [<ffffffff810c0ab0>] ? process_one_work+0x410/0x410
[  136.189346]  [<ffffffff810c6618>] kthread+0xd8/0xf0
[  136.189348]  [<ffffffff817e38bf>] ret_from_fork+0x1f/0x40
[  136.189350]  [<ffffffff810c6540>] ? kthread_worker_fn+0x180/0x180
[  136.189351] ---[ end trace 694ecd151f58f1a6 ]---

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