diff options
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 552e71d5aa5f..f7e292bf2baf 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1337,15 +1337,17 @@ 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 (!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 (memchr_inv(guid, 0, 16)) + return true; + + salt = get_jiffies_64(); + + memcpy(&guid[0], &salt, sizeof(u64)); + memcpy(&guid[8], &salt, sizeof(u64)); + + return false; } #if 0 |