[Bluez-devel] [Patch] Flush Occurred Event

[Jui-Hao Chiang <windtracekimo@gmail.com>]

>
The following is a patch against 2.6.22 kernel to catch HCI "Flush Occurred"
event. (meaningful for ACL; useless for SCO)

One more thing to NOTICE is that the handle in the event packet from my adapter
seems to be "Big Endian", so that I use ntohs to convert it.
Normally it should be __le16_to_cpu(ev->handle)

diff -r linux-source-2.6.22/include/net/bluetooth/hci_core.h
patch-2.6.22/include/net/bluetooth/hci_core.h
27a28
> 
diff -r linux-source-2.6.22/include/net/bluetooth/hci.h
patch-2.6.22/include/net/bluetooth/hci.h
587a588,595
> /* Flush Occurred Event JuiHao --*/
> #define HCI_EV_FLUSH_OCCURRED	0x11
> #define NUM_OF_FLUSH_PKT	0x1
> struct hci_ev_flush_occurred {
> 	__le16   handle;
> } __attribute__ ((packed));
> /* --Flush Occurred Event JuiHao */
> 
diff -r linux-source-2.6.22/net/bluetooth/hci_event.c
patch-2.6.22/net/bluetooth/hci_event.c
854a855,882
> /* Flush Occurred packet JuiHao*/
> static inline void hci_flush_occurred_evt(struct hci_dev *hdev, struct sk_buff
*skb)
> {
> 	struct hci_ev_flush_occurred *ev = (struct hci_ev_flush_occurred *) skb->data;
> 	struct hci_conn *conn;
> 	
> 	tasklet_disable(&hdev->tx_task);
> 
> 	BT_DBG("handle is %x, skb->len %d\n", ev->handle, skb->len);	
> 
> 	/* The handle returned is probably Big Endian such that  __le16_to_cpu is
useless*/
> 	conn = hci_conn_hash_lookup_handle(hdev, ntohs(ev->handle));
> 
> 	if (conn) {
> 		atomic_sub(NUM_OF_FLUSH_PKT, &conn->sent);
> 
> 		if (conn->type == ACL_LINK) {
> 			if ((hdev->acl_cnt += NUM_OF_FLUSH_PKT) > hdev->acl_pkts)
> 				hdev->acl_cnt = hdev->acl_pkts;
> 		}
> 		BT_DBG("conn %p type %d hdev->acl_cnt %d conn->sent %d",
> 			conn, conn->type, hdev->acl_cnt, atomic_read(&conn->sent));
> 	}
> 	hci_sched_tx(hdev);
> 
> 	tasklet_enable(&hdev->tx_task);
> }
> 
1289a1318,1322
> 	/* handle Flush Occurred Event JuiHao --*/
> 	case HCI_EV_FLUSH_OCCURRED:
> 		hci_flush_occurred_evt(hdev, skb);
> 		break;	
> 	/* -- handle Flush Occurred Event JuiHao */

Bests,
Jui-Hao


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