[Bug 70336] New: [HSW regression] module_reload doesn't work on Haswell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70336

          Priority: high
            Bug ID: 70336
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW regression] module_reload doesn't work on Haswell
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: xunx.fang at intel.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

System Environment:
--------------------------
Platform: Haswell
Kernel:    (drm-intel-fixes)d32270460fee83e22ee9e6b1bfd7b486263eeb1d

Bug detailed description:
-----------------------------
Runnig module_reload, the output shows:
ERROR: Module i915 is in use
WARNING: i915.ko still loaded!

I did an analysis:
 After running "echo 0 > /sys/class/vtconsole/vtcon1/bind", "lsmod" showed
there were still 2 programs using i915 module. It only happened on haswell
since Kernel 3.12-rc2. I found it was snd_hda_intel that use i915 module.
Unloading snd_hda_intel, module_reload worked.

[root at x-hsw24 ~]# lsmod
Module                  Size  Used by
snd_hda_codec_realtek    34049  1
snd_hda_codec_hdmi     27236  1
snd_hda_intel          25263  0
snd_hda_codec         100145  3
snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
snd_hwdep               5094  1 snd_hda_codec
snd_seq                41921  0
snd_seq_device          4581  1 snd_seq
snd_pcm                66241  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
iTCO_wdt                4551  1
iTCO_vendor_support     1608  1 iTCO_wdt
snd_timer              15514  2 snd_seq,snd_pcm
snd                    50169  9
snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer
serio_raw               3929  0
pcspkr                  1699  0
microcode               7049  0
soundcore               4219  1 snd
i2c_i801                8374  0
snd_page_alloc          5930  2 snd_hda_intel,snd_pcm
lpc_ich                12608  0
mfd_core                2441  1 lpc_ich
acpi_cpufreq            6299  0
freq_table              2068  1 acpi_cpufreq
uinput                  6676  0
ipv6                  246159  43
i915                  531119  2
drm_kms_helper         22993  1 i915
drm                   199664  2 i915,drm_kms_helper
button                  4261  1 i915
video                  10625  1 i915
dm_mirror              11024  0
dm_region_hash          5831  1 dm_mirror
dm_log                  7220  2 dm_mirror,dm_region_hash
dm_mod                 66376  2 dm_mirror,dm_logReproduce steps:

Reproduce steps:
----------------------------
1. ./module_reload

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