Bluetooth: Controller: Fix stuck forced continuation under throughput

Fix stuck forced continuation of connection event under high
throughput scenario. At near supervision timeout the force
flag is set, but in the next connection event if full
connection interval is used for data transmission and a
subsequent request to abort happens it was not honoured
causing the tx-rx chain to keep continuing until supervision
timeout.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>

Author: cvinayak

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_conn.c

@@ -165,15 +165,16 @@ int lll_conn_central_is_abort_cb(void *next, void *curr,
 {
 	struct lll_conn *lll = curr;
 
-	/* Do not abort if near supervision timeout */
-	if (lll->forced) {
-		return 0;
-	}
+	if (next != curr) {
+		/* Do not be aborted by a different event if near supervision timeout */
+		if ((lll->forced == 1U) && (trx_cnt < 1U)) {
+			return 0;
+		}
 
-	/* Do not be aborted by same event if a single central trx has not been
-	 * exchanged.
-	 */
-	if ((next == curr) && (trx_cnt < 1U)) {
+	} else if (trx_cnt < 1U) {
+		/* Do not be aborted by same event if a single central's Rx has not completed.
+		 * Cases where single trx duration can be greater than connection interval.
+		 */
 		return -EBUSY;
 	}
 
@@ -187,15 +188,16 @@ int lll_conn_peripheral_is_abort_cb(void *next, void *curr,
 {
 	struct lll_conn *lll = curr;
 
-	/* Do not abort if near supervision timeout */
-	if (lll->forced) {
-		return 0;
-	}
+	if (next != curr) {
+		/* Do not be aborted by a different event if near supervision timeout */
+		if ((lll->forced == 1U) && (tx_cnt < 1U)) {
+			return 0;
+		}
 
-	/* Do not be aborted by same event if a single peripheral trx has not
-	 * been exchanged.
-	 */
-	if ((next == curr) && (tx_cnt < 1U)) {
+	} else if (tx_cnt < 1U) {
+		/* Do not be aborted by same event if a single peripheral's Tx has not completed.
+		 * Cases where single trx duration can be greater than connection interval.
+		 */
 		return -EBUSY;
 	}