From mboxrd@z Thu Jan 1 00:00:00 1970 From: Akinobu Mita 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> References: <1352463043-9408-1-git-send-email-akinobu.mita@gmail.com> Return-path: In-Reply-To: <1352463043-9408-1-git-send-email-akinobu.mita@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Cc: Akinobu Mita , David Airlie , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.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