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..16482000 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -307,12 +307,9 @@
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;
}