drm/ttm: Force re-init if ttm_global_init() fails

If we have a failure, decrement the reference count so that the next
call to ttm_global_init() will actually do something instead of assume
everything is all set up.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Fixes: 62b53b37e4b1 ("drm/ttm: use a static ttm_bo_global instance")
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210720181357.2760720-5-jason@jlekstrand.net
Signed-off-by: Christian König <christian.koenig@amd.com>

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 5f31ace..519deea 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -100,6 +100,8 @@ static int ttm_global_init(void)
        debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
                                &glob->bo_count);
 out:
+       if (ret)
+               --ttm_glob_use_count;
        mutex_unlock(&ttm_global_mutex);
        return ret;
 }