[Bug 92740] Unclaimed register detected before writing to register 0x20a8

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92740

--- Comment #5 from andrew at lunn.ch ---
Hi Jani

Tested with 4.6.0-rc5

[  577.961088] ------------[ cut here ]------------
[  577.961129] WARNING: CPU: 3 PID: 562 at
drivers/gpu/drm/i915/intel_uncore.c:649 __unclaimed_reg_debug+0x77/0x80 [i915]
[  577.961132] Unclaimed register detected before reading register 0x23a0
[  577.961133] Modules linked in: intel_rapl x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel sha256_ssse3 sha256_generic joydev hmac drbg ansi_cprng
aesni_intel snd_hda_codec_realtek aes_x86_64 lrw arc4 btusb gf128mul iwlmvm
mac80211 snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt btrtl glue_helper
iwlwifi btbcm snd_hda_intel snd_hda_codec snd_hda_core evdev ablk_helper cryptd
ir_lirc_codec snd_hwdep cfg80211 psmouse iTCO_vendor_support btintel serio_raw
bluetooth pcspkr snd_pcm i915 lirc_dev snd_timer i2c_designware_platform
dw_dmac rc_rc6_mce nuvoton_cir rc_core drm_kms_helper drm rfkill
i2c_designware_core dw_dmac_core snd sg i2c_algo_bit i2c_i801 mei_me battery
snd_soc_sst_acpi snd_soc_sst_match video button soundcore shpchp
[  577.961186]  lpc_ich mei mfd_core acpi_pad tpm_tis tpm tun autofs4 ext4
crc16 jbd2 mbcache hid_logitech_hidpp hid_logitech_dj usbhid sd_mod
crc32c_intel ahci libahci libata scsi_mod ehci_pci ehci_hcd xhci_pci xhci_hcd
e1000e ptp usbcore pps_core usb_common fan thermal sdhci_acpi sdhci mmc_core
i2c_hid hid
[  577.961215] CPU: 3 PID: 562 Comm: Xorg Not tainted 4.6.0-rc5 #7
[  577.961217] Hardware name:                  /NUC5i3RYB, BIOS
RYBDWi35.86A.0350.2015.0812.1722 08/12/2015
[  577.961220]  0000000000000000 ffffffff812e2585 ffff880256d83d60
0000000000000000
[  577.961224]  ffffffff810749be 00000000000023a0 ffff880256d83db0
0000000000000001
[  577.961227]  ffff88024c0620f8 0000000000000001 0000000000000002
ffffffff81074a2f
[  577.961231] Call Trace:
[  577.961233]  <IRQ>  [<ffffffff812e2585>] ? dump_stack+0x5c/0x77
[  577.961242]  [<ffffffff810749be>] ? __warn+0xbe/0xe0
[  577.961245]  [<ffffffff81074a2f>] ? warn_slowpath_fmt+0x4f/0x60
[  577.961274]  [<ffffffffa049edf7>] ? __unclaimed_reg_debug+0x77/0x80 [i915]
[  577.961300]  [<ffffffffa04a1f2d>] ? gen6_read32+0x1cd/0x200 [i915]
[  577.961327]  [<ffffffffa0494dca>] ? intel_lrc_irq_handler+0x3a/0x230 [i915]
[  577.961331]  [<ffffffff810a5219>] ? enqueue_task_fair+0x4e9/0x1210
[  577.961355]  [<ffffffffa04528e6>] ? gen8_gt_irq_handler+0x226/0x240 [i915]
[  577.961377]  [<ffffffffa0452966>] ? gen8_irq_handler+0x66/0x690 [i915]
[  577.961381]  [<ffffffff8109ad74>] ? ttwu_do_wakeup+0x14/0xe0
[  577.961384]  [<ffffffff810c5f18>] ? handle_irq_event_percpu+0x78/0x1b0
[  577.961387]  [<ffffffff810c6089>] ? handle_irq_event+0x39/0x60
[  577.961390]  [<ffffffff810c922b>] ? handle_edge_irq+0x7b/0x140
[  577.961394]  [<ffffffff8102dd89>] ? handle_irq+0x19/0x30
[  577.961397]  [<ffffffff8158c8c6>] ? do_IRQ+0x46/0xd0
[  577.961401]  [<ffffffff8158aa02>] ? common_interrupt+0x82/0x82
[  577.961402]  <EOI>  [<ffffffff81589c61>] ?
_raw_spin_unlock_irqrestore+0x11/0x20
[  577.961409]  [<ffffffff810d9852>] ? hrtimer_start_range_ns+0x1c2/0x3b0
[  577.961413]  [<ffffffff8158968c>] ?
schedule_hrtimeout_range_clock+0xac/0x1a0
[  577.961416]  [<ffffffff810d9060>] ? __hrtimer_init+0x90/0x90
[  577.961419]  [<ffffffff8158968c>] ?
schedule_hrtimeout_range_clock+0xac/0x1a0
[  577.961423]  [<ffffffff811e7fc0>] ? poll_schedule_timeout+0x40/0x70
[  577.961426]  [<ffffffff811e8a08>] ? do_select+0x6f8/0x7f0
[  577.961431]  [<ffffffff810d859e>] ? mod_timer_pinned+0xce/0x1b0
[  577.961435]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961438]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961441]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961443]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961445]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961448]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961450]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961453]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961455]  [<ffffffff811e8140>] ? poll_select_copy_remaining+0x120/0x120
[  577.961457]  [<ffffffff811e8c88>] ? core_sys_select+0x188/0x270
[  577.961460]  [<ffffffff811d4abf>] ? do_readv_writev+0x11f/0x210
[  577.961463]  [<ffffffff812eae14>] ? timerqueue_add+0x54/0xa0
[  577.961465]  [<ffffffff812eae8e>] ? timerqueue_del+0x1e/0x60
[  577.961467]  [<ffffffff810d91c5>] ? __remove_hrtimer+0x35/0x90
[  577.961469]  [<ffffffff810de0f4>] ? ktime_get_ts64+0x44/0xf0
[  577.961472]  [<ffffffff811e8e17>] ? SyS_select+0xa7/0xe0
[  577.961475]  [<ffffffff8158a0b6>] ? entry_SYSCALL_64_fastpath+0x1e/0xa8
[  577.961476] ---[ end trace 589f29edb1935f5c ]---

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