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    Subject[PATCH 61/75] drm/cirrus: Invalidate page tables when pinning a BO
    Date
    3.5.7.19 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Michal Srb <msrb@suse.com>

    commit 109a51598869a39fdcec2d49672a9a39b6d89481 upstream.

    This is a cirrus version of Egbert Eich's patch for mgag200.

    Without bo.bdev->dev_mapping set, the ttm_bo_unmap_virtual_locked
    called from ttm_bo_handle_move_mem returns with no effect. If any
    application accessed the memory before it was moved, it will
    access wrong memory next time. This causes crashes when changing
    resolution down.

    Signed-off-by: Michal Srb <msrb@suse.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/gpu/drm/cirrus/cirrus_ttm.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/gpu/drm/cirrus/cirrus_ttm.c b/drivers/gpu/drm/cirrus/cirrus_ttm.c
    index d4b1b1d..d57bcc8 100644
    --- a/drivers/gpu/drm/cirrus/cirrus_ttm.c
    +++ b/drivers/gpu/drm/cirrus/cirrus_ttm.c
    @@ -353,6 +353,7 @@ int cirrus_bo_create(struct drm_device *dev, int size, int align,

    cirrusbo->gem.driver_private = NULL;
    cirrusbo->bo.bdev = &cirrus->ttm.bdev;
    + cirrusbo->bo.bdev->dev_mapping = dev->dev_mapping;

    cirrus_ttm_placement(cirrusbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);

    --
    1.8.3.2


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