[Bug 88573] New: [all Regression]igt/drv_module_reload doesn't reload module

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88573

            Bug ID: 88573
           Summary: [all Regression]igt/drv_module_reload doesn't reload
                    module
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112448
  --> https://bugs.freedesktop.org/attachment.cgi?id=112448&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes,igt
good commit: 329f7a3734331cb57895a675d4fc87c261f338bd
bad commit: 20d6e0f41b3b70a89946e5271bc4ffa7695be1b0

Non-working platforms: all

==kernel==
--------------------------
2015_01_05/drm-intel-nightly/07d0c831d9207c937595f081c8fddbddbf53756f
commit 07d0c831d9207c937595f081c8fddbddbf53756f
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Tue Dec 30 15:02:01 2014 +0200

    drm-intel-nightly: 2014y-12m-30d-13h-01m-34s UTC integration manifest


==Bug detailed description==
-----------------------------
module unloaded successfully, but it doesn't reload module.
It's igt regression. The return code is 0, and we reboot system after execute
this case. So we didn't catch this issue, until I retest bug 88433.

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]# echo $?
0
[root at x-hnr9 tests]# ./drv_module_reload
 i915 debugfs path not found.

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

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