[Bug 46274] New: Reading from /sys/kernel/debug/dri/0/radeon_ring_cp* cause null-pointer dereference

[Bug 46274] New: Reading from /sys/kernel/debug/dri/0/radeon_ring_cp* cause null-pointer dereference

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=46274

             Bug #: 46274
           Summary: Reading from /sys/kernel/debug/dri/0/radeon_ring_cp*
                    cause null-pointer dereference
    Classification: Unclassified
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: thomas.lindroth@gmail.com


Using evergreen(cedar) hardware reading from /sys/kernel/debug/dri/0/radeon_ring_cp[12] cause null-pointer dereference with latest linus git(3.3-rc4).

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[Bug 46274] Reading from /sys/kernel/debug/dri/0/radeon_ring_cp* cause null-pointer dereference

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=46274

--- Comment #1 from Michel Dänzer <michel@daenzer.net> 2012-02-20 09:24:58 PST ---
Created attachment 57337
  --> https://bugs.freedesktop.org/attachment.cgi?id=57337
Only create additional ring info files on Cayman or newer

This patch should not create the additional files at all for your card. I've only been able to compile-test it, does it work for you?

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[Bug 46274] Reading from /sys/kernel/debug/dri/0/radeon_ring_cp* cause null-pointer dereference

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=46274

--- Comment #2 from Michel Dänzer <michel@daenzer.net> 2012-02-22 01:55:59 PST ---
I've tested the fix and submitted it, should make it into 3.3 final.

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[Bug 46274] Reading from /sys/kernel/debug/dri/0/radeon_ring_cp* cause null-pointer dereference

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=46274

--- Comment #3 from Florian Mickler <florian@mickler.org> 2012-02-27 14:29:59 PST ---
A patch referencing this bug report has been merged in Linux v3.3-rc5:

commit f0d14daa6906070ca044b86f483fdde7d81f5294
Author: Michel Dänzer <michel.daenzer@amd.com>
Date:   Tue Feb 21 17:39:15 2012 +0100

    drm/radeon: Only create additional ring debugfs files on Cayman or newer.

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[Bug 46274] Reading from /sys/kernel/debug/dri/0/radeon_ring_cp* cause null-pointer dereference

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=46274

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #4 from Michel Dänzer <michel@daenzer.net> 2012-02-28 00:03:24 PST ---
Resolving per comment #3.

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