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drm: use memchr_inv()

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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>
This commit is contained in:
Akinobu Mita 2012-11-09 12:10:42 +00:00 committed by Dave Airlie
parent c61eef726a
commit 6311803b12
1 changed files with 2 additions and 5 deletions
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7
drivers/gpu/drm/drm_edid.c
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@ -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;
}