drm/mgag200: fix oops in cursor code.

In some cases we enter the cursor code with file_priv = NULL causing an oops,
we also can try to unpin something that isn't pinned, and this is a good fix for it.

Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/gpu/drm/mgag200/mgag200_cursor.c b/drivers/gpu/drm/mgag200/mgag200_cursor.c
index 801731aeab61..9f9780b7ddf0 100644
--- a/drivers/gpu/drm/mgag200/mgag200_cursor.c
+++ b/drivers/gpu/drm/mgag200/mgag200_cursor.c
@@ -22,8 +22,10 @@ static void mga_hide_cursor(struct mga_device *mdev)
 {
         WREG8(MGA_CURPOSXL, 0);
         WREG8(MGA_CURPOSXH, 0);
-        mgag200_bo_unpin(mdev->cursor.pixels_1);
-        mgag200_bo_unpin(mdev->cursor.pixels_2);
+        if (mdev->cursor.pixels_1->pin_count)
+                mgag200_bo_unpin(mdev->cursor.pixels_1);
+        if (mdev->cursor.pixels_2->pin_count)
+                mgag200_bo_unpin(mdev->cursor.pixels_2);
 }
 
 int mga_crtc_cursor_set(struct drm_crtc *crtc,
@@ -32,7 +34,7 @@ int mga_crtc_cursor_set(struct drm_crtc *crtc,
                         uint32_t width,
                         uint32_t height)
 {
-        struct drm_device *dev = (struct drm_device *)file_priv->minor->dev;
+        struct drm_device *dev = crtc->dev;
         struct mga_device *mdev = (struct mga_device *)dev->dev_private;
         struct mgag200_bo *pixels_1 = mdev->cursor.pixels_1;
         struct mgag200_bo *pixels_2 = mdev->cursor.pixels_2;