[Bug 88911] New: [ILK]igt/drv_suspend/sysfs-reader cause dmesg warn.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88911

            Bug ID: 88911
           Summary: [ILK]igt/drv_suspend/sysfs-reader cause dmesg warn.
           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: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113037
  --> https://bugs.freedesktop.org/attachment.cgi?id=113037&action=edit
dmesg for case igt/drv_suspend/sysfs-reader

==System Environment==
--------------------------
Regression: yes
Non-working platforms:  ILK
==kernel==
--------------------------
drm-intel-nightly/8b4216f91c7bf8d3459cadf9480116220bd6545e(2015-02-02)


==Bug detailed description==
-----------------------------
check dmesg after run this case.
dmesg -r|egrep "<[1-4]>"|grep drm
<4>[    1.415809] WARNING: CPU: 3 PID: 1219 at
drivers/gpu/drm/i915/intel_uncore.c:169
intel_uncore_forcewake_reset+0x18b/0x27e [i915]()
<4>[    1.416176]  i915(+) button video drm_kms_helper drm cfbfillrect
cfbimgblt cfbcopyarea
<4>[    1.416178] CPU: 3 PID: 1219 Comm: udevd Not tainted
3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126
<4>[    1.416338]  [<ffffffffa00135ac>] ? drm_dev_register+0x74/0xe6 [drm]
<4>[    1.416344]  [<ffffffffa0015952>] ? drm_get_pci_dev+0xf7/0x1b2 [drm]
<4>[  100.666822] WARNING: CPU: 2 PID: 3798 at
drivers/gpu/drm/i915/intel_uncore.c:169
intel_uncore_forcewake_reset+0x18b/0x27e [i915]()
<4>[  100.666838] Modules linked in: ip6table_filter ip6_tables ebtable_nat
ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables
bridge stp llc ipv6 dm_mod snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic iTCO_wdt iTCO_vendor_support ppdev dcdbas serio_raw
pcspkr i2c_i801 snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep
snd_pcm wmi snd_timer lpc_ich mfd_core snd soundcore parport_pc parport tpm_tis
tpm acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
<4>[  100.666841] CPU: 2 PID: 3798 Comm: kworker/u16:13 Tainted: G        W    
 3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126
<4>[  100.666885]  [<ffffffffa00858dd>] ? i915_drm_suspend+0x17d/0x1b3 [i915]
<4>[  101.073540] WARNING: CPU: 1 PID: 3826 at
drivers/gpu/drm/i915/intel_uncore.c:169
intel_uncore_forcewake_reset+0x18b/0x27e [i915]()
<4>[  101.073557] Modules linked in: ip6table_filter ip6_tables ebtable_nat
ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables
bridge stp llc ipv6 dm_mod snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic iTCO_wdt iTCO_vendor_support ppdev dcdbas serio_raw
pcspkr i2c_i801 snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep
snd_pcm wmi snd_timer lpc_ich mfd_core snd soundcore parport_pc parport tpm_tis
tpm acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
<4>[  101.073560] CPU: 1 PID: 3826 Comm: kworker/u16:41 Tainted: G        W    
 3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126
<4>[  101.073606]  [<ffffffffa00863a3>] ? i915_drm_resume_early+0x94/0x94
[i915]
<4>[  101.073623]  [<ffffffffa008636c>] ? i915_drm_resume_early+0x5d/0x94
[i915]

the following cases have the similar dmesg, and bisect result were the same.
igt/drv_suspend/sysfs-reader 
igt/drv_suspend/forcewake 
igt/drv_suspend/fence-restore-untiled 
igt/drv_suspend/fence-restore-tiled2untiled 
igt/drv_suspend/debugfs-reader 
==Reproduce steps==
---------------------------- 
1. ./drv_suspend --run-subtest sysfs-reader

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