hci_h5: Don't send conf_req when ACTIVE

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------

Without this patch, a modem and kernel can continuously bombard each
other with conf_req and conf_rsp messages, in a demented game of tag.
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/bluetooth/hci_h5.c

@@ -343,7 +343,8 @@ static void h5_handle_internal_rx(struct hci_uart *hu)
 		h5_link_control(hu, conf_req, 3);
 	} else if (memcmp(data, conf_req, 2) == 0) {
 		h5_link_control(hu, conf_rsp, 2);
-		h5_link_control(hu, conf_req, 3);
+		if (h5->state != H5_ACTIVE)
+		    h5_link_control(hu, conf_req, 3);
 	} else if (memcmp(data, conf_rsp, 2) == 0) {
 		if (H5_HDR_LEN(hdr) > 2)
 			h5->tx_win = (data[2] & 0x07);