From: Chris Wilson Date: Wed, 26 Jun 2019 09:43:30 +0000 (+0100) Subject: drm: Allow range of 0 for drm_mm_insert_node_in_range() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c1a495a558536c5745c6449f7c04ba3cf40be9da;p=linux.git 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 Cc: Joonas Lahtinen Cc: Daniele Ceraolo Spurio Cc: Daniel Vetter Reviewed-by: Daniele Ceraolo Spurio 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 9a59865ce574f..4581c53873722 100644 --- 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;