1 files changed, 12 insertions, 1 deletions

diff --git a/net/mac802154/util.c b/net/mac802154/util.c
index 5fc979027919..150bf807e572 100644
--- a/net/mac802154/util.c
+++ b/net/mac802154/util.c
@@ -65,8 +65,19 @@ void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
 {
         if (ifs_handling) {
                 struct ieee802154_local *local = hw_to_local(hw);
+                u8 max_sifs_size;
 
-                if (skb->len > 18)
+                /* If transceiver sets CRC on his own we need to use lifs
+                 * threshold len above 16 otherwise 18, because it's not
+                 * part of skb->len.
+                 */
+                if (hw->flags & IEEE802154_HW_TX_OMIT_CKSUM)
+                        max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE -
+                                        IEEE802154_FCS_LEN;
+                else
+                        max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE;
+
+                if (skb->len > max_sifs_size)
                         hrtimer_start(&local->ifs_timer,
                                       ktime_set(0, hw->phy->lifs_period * NSEC_PER_USEC),
                                       HRTIMER_MODE_REL);