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drm/dp/mst: Use memchr_inv() instead of memcmp() against a zeroed array 

We have memch_inv(), so no need to memcmp() against a zeroed temp array.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170712155254.26455-1-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2017-07-12 18:52:54 +03:00
parent a4370c7774
commit e38e128950
1 changed files with 10 additions and 8 deletions
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12
drivers/gpu/drm/drm_dp_mst_topology.c
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@ -1337,16 +1337,18 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work)
static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
u8 *guid)
{
static u8 zero_guid[16];
u64 salt;
if (memchr_inv(guid, 0, 16))
return true;
salt = get_jiffies_64();
if (!memcmp(guid, zero_guid, 16)) {
u64 salt = get_jiffies_64();
memcpy(&guid[0], &salt, sizeof(u64));
memcpy(&guid[8], &salt, sizeof(u64));
return false;
}
return true;
}
#if 0
static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)