From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753257Ab2KIMLT (ORCPT ); Fri, 9 Nov 2012 07:11:19 -0500 Received: from mail-pb0-f46.google.com ([209.85.160.46]:52153 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753044Ab2KIMLP (ORCPT ); Fri, 9 Nov 2012 07:11:15 -0500 From: Akinobu Mita To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Cc: Akinobu Mita , David Airlie , dri-devel@lists.freedesktop.org Subject: [PATCH] drm: use memchr_inv() Date: Fri, 9 Nov 2012 21:10:42 +0900 Message-Id: <1352463043-9408-2-git-send-email-akinobu.mita@gmail.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1352463043-9408-1-git-send-email-akinobu.mita@gmail.com> References: <1352463043-9408-1-git-send-email-akinobu.mita@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use memchr_inv() to check the specified memory region is filled with zero. Signed-off-by: Akinobu Mita Cc: David Airlie Cc: dri-devel@lists.freedesktop.org --- drivers/gpu/drm/drm_edid.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index fadcd44..59260bf 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -307,12 +307,9 @@ drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, static bool drm_edid_is_zero(u8 *in_edid, int length) { - int i; - u32 *raw_edid = (u32 *)in_edid; + if (memchr_inv(in_edid, 0, length)) + return false; - for (i = 0; i < length / 4; i++) - if (*(raw_edid + i) != 0) - return false; return true; } -- 1.7.11.7