drm: Allow range of 0 for drm_mm_insert_node_in_range()

We gracefully handle the caller specifying a zero range, so don't force
them to special case that condition if it naturally falls out of their
setup. What we don't check is if the end < start, so keep that as an
assert for an illegal call.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190626094330.3556-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 9a59865..4581c53 100644 (file)
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -472,7 +472,7 @@ int drm_mm_insert_node_in_range(struct drm_mm * const mm,
        u64 remainder_mask;
        bool once;
 
-       DRM_MM_BUG_ON(range_start >= range_end);
+       DRM_MM_BUG_ON(range_start > range_end);
 
        if (unlikely(size == 0 || range_end - range_start < size))
                return -ENOSPC;