[WARNING 4.1-rc2] i915: Unclaimed register detected before writing to register 0xc4040

[Steven Rostedt]

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 WARNING: CPU: 2 PID: 0 at /work/autotest/nobackup/linux-test.git/drivers/gpu/drm/i915/intel_uncore.c:566 hsw_unclaimed_reg_debug.isra.10+0x6c/0x84()
 Unclaimed register detected before writing to register 0xc4040
 Modules linked in: microcode r8169
 CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.1.0-rc2-test+ #4
 Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
  0000000000000236 ffff880215203c68 ffffffff81ba8161 0000000000000000
  ffff880215203cb8 ffff880215203ca8 ffffffff81080dbb 0000000000000000
  ffffffff81626bc6 ffff88020de60068 00000000000c4040 0000000000000001
 Call Trace:
  <IRQ>  [<ffffffff81ba8161>] dump_stack+0x4c/0x65
  [<ffffffff81080dbb>] warn_slowpath_common+0xa1/0xbb
  [<ffffffff81626bc6>] ? hsw_unclaimed_reg_debug.isra.10+0x6c/0x84
  [<ffffffff81080e78>] warn_slowpath_fmt+0x46/0x48
  [<ffffffff81626bc6>] hsw_unclaimed_reg_debug.isra.10+0x6c/0x84
  [<ffffffff81629ac4>] hsw_write32+0x86/0xcf
  [<ffffffff81616246>] cpt_irq_handler+0x1e8/0x1f5
  [<ffffffff81616347>] ivb_display_irq_handler+0xf4/0x11b
  [<ffffffff81619837>] ironlake_irq_handler+0x187/0x24d
  [<ffffffff810ceba8>] handle_irq_event_percpu+0xf7/0x2a3
  [<ffffffff810ced95>] handle_irq_event+0x41/0x64
  [<ffffffff810d17e3>] handle_edge_irq+0xa0/0xb9
  [<ffffffff8103f961>] handle_irq+0x11d/0x128
  [<ffffffff8109d5a0>] ? atomic_notifier_call_chain+0x14/0x16
  [<ffffffff81bc2fde>] do_IRQ+0x4e/0xc4
  [<ffffffff81bc11f0>] common_interrupt+0x70/0x70
  <EOI>  [<ffffffff819c9788>] ? cpuidle_enter_state+0xd8/0x135
  [<ffffffff819c9784>] ? cpuidle_enter_state+0xd4/0x135
  [<ffffffff819c9811>] cpuidle_enter+0x17/0x19
  [<ffffffff810b545a>] cpuidle_idle_call+0xf2/0x180
  [<ffffffff810b5613>] cpu_idle_loop+0x12b/0x164
  [<ffffffff810b565f>] cpu_startup_entry+0x13/0x14
  [<ffffffff81066a3a>] start_secondary+0x102/0x106
  [<ffffffff81066938>] ? set_cpu_sibling_map+0x35e/0x35e
 ---[ end trace 77c6a96cf41e96d1 ]---

I'm still triggering warnings in the i915 code. :-(

config attached.

-- Steve
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