From patchwork Wed Jun 26 09:43:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 11017363 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8571D6C5 for ; Wed, 26 Jun 2019 09:44:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7369B28737 for ; Wed, 26 Jun 2019 09:44:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 65ACF28750; Wed, 26 Jun 2019 09:44:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 22AB42873A for ; Wed, 26 Jun 2019 09:44:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9CF7B6E343; Wed, 26 Jun 2019 09:44:54 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id E0F456E343; Wed, 26 Jun 2019 09:44:52 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 17028295-1500050 for multiple; Wed, 26 Jun 2019 10:43:34 +0100 From: Chris Wilson To: dri-devel@lists.freedesktop.org Subject: [PATCH] drm: Allow range of 0 for drm_mm_insert_node_in_range() Date: Wed, 26 Jun 2019 10:43:30 +0100 Message-Id: <20190626094330.3556-1-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniele Ceraolo Spurio , Daniel Vetter , intel-gfx@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 --- drivers/gpu/drm/drm_mm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index 9a59865ce574..4581c5387372 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;