[PATCH 4.19 177/205] drm/nouveau: Check backlight IDs are >= 0, not > 0

[Greg Kroah-Hartman]

4.19-stable review patch.  If anyone has any objections, please let me know.

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

From: Lyude Paul <ly...@redhat.com>

commit dc854914999d5d52ac1b31740cb0ea8d89d0372e upstream.

Remember, ida IDs start at 0, not 1!

Signed-off-by: Lyude Paul <ly...@redhat.com>
Reviewed-by: Karol Herbst <kher...@redhat.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Ben Skeggs <bske...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/gpu/drm/nouveau/nouveau_backlight.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -116,7 +116,7 @@ nv40_backlight_init(struct drm_connector
                                       &nv40_bl_ops, &props);
 
        if (IS_ERR(bd)) {
-               if (bl_connector.id > 0)
+               if (bl_connector.id >= 0)
                        ida_simple_remove(&bl_ida, bl_connector.id);
                return PTR_ERR(bd);
        }
@@ -249,7 +249,7 @@ nv50_backlight_init(struct drm_connector
                                       nv_encoder, ops, &props);
 
        if (IS_ERR(bd)) {
-               if (bl_connector.id > 0)
+               if (bl_connector.id >= 0)
                        ida_simple_remove(&bl_ida, bl_connector.id);
                return PTR_ERR(bd);
        }