Bluetooth: make use of connection number to optimize the scheduler

This checks if there is any existing connection according to its type
before start iterating in the list and immediately stop iterating when
reaching the number of connections.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 56943add45cc..1d2068322728 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2074,6 +2074,9 @@ static inline struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type, int
                         min  = c->sent;
                         conn = c;
                 }
+
+                if (hci_conn_num(hdev, type) == num)
+                        break;
         }
 
         if (conn) {
@@ -2131,6 +2134,9 @@ static inline void hci_sched_acl(struct hci_dev *hdev)
 
         BT_DBG("%s", hdev->name);
 
+        if (!hci_conn_num(hdev, ACL_LINK))
+                return;
+
         if (!test_bit(HCI_RAW, &hdev->flags)) {
                 /* ACL tx timeout must be longer than maximum
                  * link supervision timeout (40.9 seconds) */
@@ -2162,6 +2168,9 @@ static inline void hci_sched_sco(struct hci_dev *hdev)
 
         BT_DBG("%s", hdev->name);
 
+        if (!hci_conn_num(hdev, SCO_LINK))
+                return;
+
         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, &quote))) {
                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
                         BT_DBG("skb %p len %d", skb, skb->len);
@@ -2182,6 +2191,9 @@ static inline void hci_sched_esco(struct hci_dev *hdev)
 
         BT_DBG("%s", hdev->name);
 
+        if (!hci_conn_num(hdev, ESCO_LINK))
+                return;
+
         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, ESCO_LINK, &quote))) {
                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
                         BT_DBG("skb %p len %d", skb, skb->len);
@@ -2202,6 +2214,9 @@ static inline void hci_sched_le(struct hci_dev *hdev)
 
         BT_DBG("%s", hdev->name);
 
+        if (!hci_conn_num(hdev, LE_LINK))
+                return;
+
         if (!test_bit(HCI_RAW, &hdev->flags)) {
                 /* LE tx timeout must be longer than maximum
                  * link supervision timeout (40.9 seconds) */