[Bug 71208] [regression] module_reload segfault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71208

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #5 from lu hua <huax.lu at intel.com> ---
(In reply to comment #2)
> Created attachment 88992 [details]
> dmesg
> 
> Test on latest -nightly branch. It still fails on -nightly branch. 
> output:
> ./drv_module_reload: line 27:  3995 Killed                  rmmod i915
> WARNING: i915.ko still loaded!
> ./drv_module_reload: line 43: /sys/class/vtconsole/vtcon1/bind: No such file
> or directory
> 


Bisect shows: 8f6599da8e772fa8de54cdf98e9e03cbaf3946da is the first bad commit.
commit 8f6599da8e772fa8de54cdf98e9e03cbaf3946da
Author:     David Herrmann <dh.herrmann at gmail.com>
AuthorDate: Sun Oct 20 18:55:45 2013 +0200
Commit:     Dave Airlie <airlied at redhat.com>
CommitDate: Wed Nov 6 14:53:25 2013 +1000

    drm: delay minor destruction to drm_dev_free()

    Instead of freeing minors in drm_dev_unregister(), we only unplug them and
    delay the free to drm_dev_free(). Note that if drm_dev_register() has
    never been called, minors are NULL and this has no effect.

    This change is needed to allow early device unregistration. If we want to
    call drm_dev_unregister() on live devices, we need to guarantee that
    minors are still valid (but unplugged). This way, any open file can still
    access file_priv->minor->dev to get the DRM device. However, the minor is
    unplugged so no new users can occur.

    Signed-off-by: David Herrmann <dh.herrmann at gmail.com>
    Signed-off-by: Dave Airlie <airlied at redhat.com>

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