From: Johan Hedberg <johan.hedberg@xxxxxxxxx>
To pave the way for future fixed channels to be added easily we should
track both the local and remote mask on a per-L2CAP connection (struct
l2cap_conn) basis. So far the code has used a global variable in a racy
way which anyway needs fixing.
This patch renames the existing conn->fixed_chan_mask that tracked
the remote mask to conn->remote_fixed_chan and adds a new variable
conn->local_fixed_chan to track the local mask. Since the HS support
info is now available in the local mask we can remove the
conn->hs_enabled variable.
Signed-off-by: Johan Hedberg <johan.hedberg@xxxxxxxxx>
---
v2: Use "data + 1" instead of "&data[1]"
include/net/bluetooth/l2cap.h | 4 ++--
net/bluetooth/l2cap_core.c | 37 ++++++++++++++++++-------------------
2 files changed, 20 insertions(+), 21 deletions(-)
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 061e648052c8..d71dc3579354 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -619,8 +619,8 @@ struct l2cap_conn {
unsigned int mtu;
__u32 feat_mask;
- __u8 fixed_chan_mask;
- bool hs_enabled;
+ __u8 remote_fixed_chan;
+ __u8 local_fixed_chan;
__u8 info_state;
__u8 info_ident;
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index c2d1489c228c..43349ed4c249 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -46,7 +46,6 @@
bool disable_ertm;
static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
-static u8 l2cap_fixed_chan[8] = { L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS, };
static LIST_HEAD(chan_list);
static DEFINE_RWLOCK(chan_list_lock);
@@ -1120,10 +1119,10 @@ static bool __amp_capable(struct l2cap_chan *chan)
struct hci_dev *hdev;
bool amp_available = false;
- if (!conn->hs_enabled)
+ if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
return false;
- if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
+ if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP))
return false;
read_lock(&hci_dev_list_lock);
@@ -3096,12 +3095,14 @@ static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
{
- return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
+ return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
+ (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW));
}
static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
{
- return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
+ return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
+ (conn->feat_mask & L2CAP_FEAT_EXT_FLOW));
}
static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
@@ -3330,7 +3331,7 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
break;
case L2CAP_CONF_EWS:
- if (!chan->conn->hs_enabled)
+ if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP))
return -ECONNREFUSED;
set_bit(FLAG_EXT_CTRL, &chan->flags);
@@ -4334,7 +4335,7 @@ static inline int l2cap_information_req(struct l2cap_conn *conn,
if (!disable_ertm)
feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
| L2CAP_FEAT_FCS;
- if (conn->hs_enabled)
+ if (conn->local_fixed_chan & L2CAP_FC_A2MP)
feat_mask |= L2CAP_FEAT_EXT_FLOW
| L2CAP_FEAT_EXT_WINDOW;
@@ -4345,14 +4346,10 @@ static inline int l2cap_information_req(struct l2cap_conn *conn,
u8 buf[12];
struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
- if (conn->hs_enabled)
- l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
- else
- l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
-
rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
- memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
+ rsp->data[0] = conn->local_fixed_chan;
+ memset(rsp->data + 1, 0, 7);
l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
buf);
} else {
@@ -4418,7 +4415,7 @@ static inline int l2cap_information_rsp(struct l2cap_conn *conn,
break;
case L2CAP_IT_FIXED_CHAN:
- conn->fixed_chan_mask = rsp->data[0];
+ conn->remote_fixed_chan = rsp->data[0];
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
conn->info_ident = 0;
@@ -4442,7 +4439,7 @@ static int l2cap_create_channel_req(struct l2cap_conn *conn,
if (cmd_len != sizeof(*req))
return -EPROTO;
- if (!conn->hs_enabled)
+ if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
return -EINVAL;
psm = le16_to_cpu(req->psm);
@@ -4872,7 +4869,7 @@ static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
- if (!conn->hs_enabled)
+ if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
return -EINVAL;
chan = l2cap_get_chan_by_dcid(conn, icid);
@@ -6964,9 +6961,11 @@ static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
conn->feat_mask = 0;
- if (hcon->type == ACL_LINK)
- conn->hs_enabled = test_bit(HCI_HS_ENABLED,
- &hcon->hdev->dev_flags);
+ conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS;
+
+ if (hcon->type == ACL_LINK &&
+ test_bit(HCI_HS_ENABLED, &hcon->hdev->dev_flags))
+ conn->local_fixed_chan |= L2CAP_FC_A2MP;
mutex_init(&conn->ident_lock);
mutex_init(&conn->chan_lock);
--
2.1.0
--
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