[Bug 21908] New: SIGSEGV when no kernel DRM present

[Bug 21908] New: SIGSEGV when no kernel DRM present

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=21908

           Summary: SIGSEGV when no kernel DRM present
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: hostcc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


Created an attachment (id=26165)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=26165)
Patch for SIGSEGV when no kernel-side DRM is present

The nouveau driver (from git on 13/04/2009) experienced SIGSEGV when no
kernel-side DRM is present.
The component version:
xserver: 1.5.3
libdrm: 2.4.9
xf86-video-nouveau: git from 13/04/2009

The problem was narrowed down to nv_driver.c:NVMapMemSW() - the function
declares 'struct nouveau_device', which in fact, should be 'struct
nouveau_device_priv' for DRM related functions to work properly.

The crashes were related to the accesses to 'mm_enabled' field of 'struct
nouveau_device_priv', which points to a garbage when only 'struct
nouveau_device' declared.

Attached patch (against git from 13/04/2009) solved the problem.


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[Bug 21908] SIGSEGV when no kernel DRM present

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=21908


Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX




--- Comment #1 from Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org>  2009-08-09 09:36:06 PST ---
Nowadays Nouveau cannot work without DRM, since it uses the memory management
(GEM+TTM) even in NoAccel mode. Non-DRM mode is gone by commit
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=f8ac9e35bd20391f923c5c5ccc509251ea23a4c5

Therefore closing this report, thanks.


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