qcacld-3.0: Fix ring refill retry logic

When system is under low memory condition and skb allocation fails,
RX ring msdu is not attached in ring replenish logic and Ring refill retry
timer refills the ring debt at the interval of 50 ms.

If refill retry fails to allocate the memory,  refill debt is not updated and
this is resulting in retry logic failure.

Update refill debt when retry allocation fails to allocate
rx ring msdu.

Change-Id: I4d2230e4984e26b44db663e7e7f20c73ae90b0f0

core/dp/htt/htt_rx.c

@@ -650,18 +650,17 @@ static void htt_rx_ring_refill_retry(void *arg)
 	qdf_atomic_sub(num, &pdev->rx_ring.refill_debt);
 	filled = htt_rx_ring_fill_n(pdev, num);
 
-	qdf_spin_unlock_bh(&(pdev->rx_ring.refill_lock));
-
 	if (filled > num) {
 		/* we served ourselves and some other debt */
 		/* sub is safer than  = 0 */
 		qdf_atomic_sub(filled - num, &pdev->rx_ring.refill_debt);
 	} else if (num == filled) { /* nothing to be done */
 	} else {
+		qdf_atomic_add(num - filled, &pdev->rx_ring.refill_debt);
 		/* we could not fill all, timer must have been started */
 		pdev->refill_retry_timer_doubles++;
 	}
-
+	qdf_spin_unlock_bh(&(pdev->rx_ring.refill_lock));
 }
 #endif
 
@@ -3187,13 +3186,14 @@ int htt_rx_msdu_buff_in_order_replenish(htt_pdev_handle pdev, uint32_t num)
 	pdev->rx_buff_fill_n_invoked++;
 	filled = htt_rx_ring_fill_n(pdev, num);
 
-	qdf_spin_unlock_bh(&(pdev->rx_ring.refill_lock));
-
 	if (filled > num) {
 		/* we served ourselves and some other debt */
 		/* sub is safer than  = 0 */
 		qdf_atomic_sub(filled - num, &pdev->rx_ring.refill_debt);
+	} else {
+		qdf_atomic_add(num - filled, &pdev->rx_ring.refill_debt);
 	}
+	qdf_spin_unlock_bh(&(pdev->rx_ring.refill_lock));
 
 	return filled;
 }