[Bug 86685] New: [SNB]igt/drv_module_reload causes "WARNING: CPU: 0 PID: 4163 at drivers/gpu/drm/i915/i915_irq.c:154 ironlake_disable_vblank+0x40/0x52 [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86685

            Bug ID: 86685
           Summary: [SNB]igt/drv_module_reload causes "WARNING: CPU: 0
                    PID: 4163 at drivers/gpu/drm/i915/i915_irq.c:154
                    ironlake_disable_vblank+0x40/0x52 [i915]()"
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 109983
  --> https://bugs.freedesktop.org/attachment.cgi?id=109983&action=edit
dmesg

==System Environment==
--------------------------
Regression: No
The tests always fail, only occurs on -fixes branch.

Non-working platforms: SNB

==kernel==
--------------------------
origin/drm-intel-nightly: ab4b258a6ea5f58b5cb17131aced8f9a8dd64499(works)
    drm-intel-nightly: 2014y-11m-24d-21h-37m-18s UTC integration manifest
origin/drm-intel-next-queued: a259953ea9b7c86e437e0a620d37aad150a00b8f(works)
    drm/i915: Stop gathering error states for CS error interrupts
origin/drm-intel-fixes: bdfa7542d40e6251c232a802231b37116bd31b11(fails)
    drm/i915: Ignore SURFLIVE and flip counter when the GPU gets reset

==Bug detailed description==
igt/drv_module_reload causes "WARNING: CPU: 0 PID: 4163 at
drivers/gpu/drm/i915/i915_irq.c:154 ironlake_disable_vblank+0x40/0x52 [i915]()"

Output:
[root at x-hnr9 tests]# ./drv_module_reload
unbinding /sys/class/vtconsole/vtcon0/: (M) frame buffer device
module successfully unloaded
[root at x-hnr9 tests]# dmesg -r|egrep ""<[1-4]>""|grep drm
<4>[  156.110067] WARNING: CPU: 0 PID: 4163 at
drivers/gpu/drm/i915/i915_irq.c:154 ironlake_disable_vblank+0x40/0x52 [i915]()
<4>[  156.110071] Modules linked in: dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support ppdev snd_hda_codec_idt snd_hda_codec_generic pcspkr
serio_raw uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core
v4l2_common videodev firewire_ohci lpc_ich mfd_core snd_hda_controller
snd_hda_codec snd_hwdep snd_pcm firewire_core crc_itu_t snd_timer snd soundcore
parport_pc parport tpm_infineon tpm_tis tpm wmi ac battery acpi_cpufreq joydev
i915(-) button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea [last
unloaded: snd_hda_intel]
<4>[  156.110103] CPU: 0 PID: 4163 Comm: rmmod Not tainted
3.18.0-rc6_drm-intel-fixes_bdfa75_20141125+ #1930
<4>[  156.110161]  [<ffffffffa0010f9e>] ? vblank_disable_and_save+0x74/0x17f
[drm]
<4>[  156.110172]  [<ffffffffa0012202>] ? drm_vblank_cleanup+0x48/0x7c [drm]
<4>[  156.110190]  [<ffffffffa0013127>] ? drm_dev_unregister+0x1e/0x8b [drm]
<4>[  156.110197]  [<ffffffffa00139b5>] ? drm_put_dev+0x45/0x4e [drm]
<4>[  156.110225]  [<ffffffffa0015221>] ? drm_pci_exit+0x39/0x9c [drm]
<4>[  156.110258] WARNING: CPU: 0 PID: 4163 at
drivers/gpu/drm/i915/i915_irq.c:154 ironlake_disable_vblank+0x40/0x52 [i915]()
<4>[  156.110261] Modules linked in: dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support ppdev snd_hda_codec_idt snd_hda_codec_generic pcspkr
serio_raw uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core
v4l2_common videodev firewire_ohci lpc_ich mfd_core snd_hda_controller
snd_hda_codec snd_hwdep snd_pcm firewire_core crc_itu_t snd_timer snd soundcore
parport_pc parport tpm_infineon tpm_tis tpm wmi ac battery acpi_cpufreq joydev
i915(-) button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea [last
unloaded: snd_hda_intel]
<4>[  156.110292] CPU: 0 PID: 4163 Comm: rmmod Tainted: G        W     
3.18.0-rc6_drm-intel-fixes_bdfa75_20141125+ #1930
<4>[  156.110342]  [<ffffffffa0010f9e>] ? vblank_disable_and_save+0x74/0x17f
[drm]
<4>[  156.110351]  [<ffffffffa0012202>] ? drm_vblank_cleanup+0x48/0x7c [drm]
<4>[  156.110368]  [<ffffffffa0013127>] ? drm_dev_unregister+0x1e/0x8b [drm]
<4>[  156.110374]  [<ffffffffa00139b5>] ? drm_put_dev+0x45/0x4e [drm]
<4>[  156.110400]  [<ffffffffa0015221>] ? drm_pci_exit+0x39/0x9c [drm]

==Reproduce steps==
---------------------------- 
1. ./drv_module_reload

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