From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Fri, 9 Nov 2012 12:10:42 +0000 (+0000)
Subject: drm: use memchr_inv()
X-Git-Tag: v3.8-rc1~42^2~169
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6311803b1294432ee680fec5e628efae0d485fa2;p=platform%2Fkernel%2Flinux-stable.git

drm: use memchr_inv()

Use memchr_inv() to check the specified memory region is filled with zero.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 856dcd9..1648200 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;
 }