• Ben Skeggs's avatar
    drm/nouveau: add per-channel mutex, use to lock access to drm's channel · 6a6b73f2
    Ben Skeggs authored
    This fixes a race condition between fbcon acceleration and TTM buffer
    moves.  To reproduce:
    - start X
    - switch to vt and "while (true); do dmesg; done"
    - switch to another vt and "sleep 2 && cat /path/to/debugfs/dri/0/evict_vram"
    - switch back to vt running dmesg
    We don't make use of this on any other channel yet, they're currently
    protected by drm_global_mutex.  This will change in the near future.
    Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>