This patch makes discovery operations cancelable by exposing the
internal discovery op structure as bt_gatt_async_req. This structure
keeps track of the ATT request ids of discovery procedures that occur
over multiple ATT protocol requests.
Users can cancel an ongoing request by calling bt_gatt_async_req_cancel.
Each discovery helper function returns a pointer to the structure with
one addition reference count assigned to the caller, so the caller is
responsible for cleaning up the memory by calling
bt_gatt_async_req_unref.
---
src/shared/gatt-helpers.c | 238 ++++++++++++++++++++++++++--------------------
src/shared/gatt-helpers.h | 23 +++--
2 files changed, 152 insertions(+), 109 deletions(-)
diff --git a/src/shared/gatt-helpers.c b/src/shared/gatt-helpers.c
index 2d07a83..e800fce 100644
--- a/src/shared/gatt-helpers.c
+++ b/src/shared/gatt-helpers.c
@@ -209,7 +209,7 @@ static bool convert_uuid_le(const uint8_t *src, size_t len, uint8_t dst[16])
return true;
}
-struct discovery_op {
+struct bt_gatt_async_req {
struct bt_att *att;
unsigned int id;
uint16_t end_handle;
@@ -226,7 +226,7 @@ struct discovery_op {
static struct bt_gatt_result *result_append(uint8_t opcode, const void *pdu,
uint16_t pdu_len,
uint16_t data_len,
- struct discovery_op *op)
+ struct bt_gatt_async_req *op)
{
struct bt_gatt_result *result;
@@ -249,7 +249,7 @@ bool bt_gatt_iter_next_included_service(struct bt_gatt_iter *iter,
uint16_t *end_handle, uint8_t uuid[16])
{
struct bt_gatt_result *read_result;
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
const void *pdu_ptr;
int i = 0;
@@ -328,7 +328,7 @@ bool bt_gatt_iter_next_service(struct bt_gatt_iter *iter,
uint16_t *start_handle, uint16_t *end_handle,
uint8_t uuid[16])
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
const void *pdu_ptr;
bt_uuid_t tmp;
@@ -370,7 +370,7 @@ bool bt_gatt_iter_next_characteristic(struct bt_gatt_iter *iter,
uint16_t *value_handle, uint8_t *properties,
uint8_t uuid[16])
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
const void *pdu_ptr;
if (!iter || !iter->result || !start_handle || !end_handle ||
@@ -446,7 +446,7 @@ bool bt_gatt_iter_next_read_by_type(struct bt_gatt_iter *iter,
uint16_t *handle, uint16_t *length,
const uint8_t **value)
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
const void *pdu_ptr;
if (!iter || !iter->result || !handle || !length || !value)
@@ -535,13 +535,14 @@ done:
op->callback(success, att_ecode, op->user_data);
}
-bool bt_gatt_exchange_mtu(struct bt_att *att, uint16_t client_rx_mtu,
+unsigned int bt_gatt_exchange_mtu(struct bt_att *att, uint16_t client_rx_mtu,
bt_gatt_result_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
struct mtu_op *op;
uint8_t pdu[2];
+ unsigned int id;
if (!att || !client_rx_mtu)
return false;
@@ -558,14 +559,12 @@ bool bt_gatt_exchange_mtu(struct bt_att *att, uint16_t client_rx_mtu,
put_le16(client_rx_mtu, pdu);
- if (!bt_att_send(att, BT_ATT_OP_MTU_REQ, pdu, sizeof(pdu),
- mtu_cb, op,
- destroy_mtu_op)) {
+ id = bt_att_send(att, BT_ATT_OP_MTU_REQ, pdu, sizeof(pdu), mtu_cb, op,
+ destroy_mtu_op);
+ if (!id)
free(op);
- return false;
- }
- return true;
+ return id;
}
static inline int get_uuid_len(const bt_uuid_t *uuid)
@@ -576,29 +575,54 @@ static inline int get_uuid_len(const bt_uuid_t *uuid)
return (uuid->type == BT_UUID16) ? 2 : 16;
}
-static struct discovery_op* discovery_op_ref(struct discovery_op *op)
+struct bt_gatt_async_req* bt_gatt_async_req_ref(struct bt_gatt_async_req *req)
{
- __sync_fetch_and_add(&op->ref_count, 1);
+ if (!req)
+ return NULL;
+
+ __sync_fetch_and_add(&req->ref_count, 1);
- return op;
+ return req;
}
-static void discovery_op_unref(void *data)
+void bt_gatt_async_req_unref(struct bt_gatt_async_req *req)
{
- struct discovery_op *op = data;
+ if (!req)
+ return;
- if (__sync_sub_and_fetch(&op->ref_count, 1))
+ if (__sync_sub_and_fetch(&req->ref_count, 1))
return;
- if (op->destroy)
- op->destroy(op->user_data);
+ bt_gatt_async_req_cancel(req);
- result_destroy(op->result_head);
+ if (req->destroy)
+ req->destroy(req->user_data);
- free(op);
+ result_destroy(req->result_head);
+
+ free(req);
+}
+
+void bt_gatt_async_req_cancel(struct bt_gatt_async_req *req)
+{
+ if (!req)
+ return;
+
+ if (!req->id)
+ return;
+
+ bt_att_cancel(req->att, req->id);
+ req->id = 0;
+}
+
+static void async_req_unref(void *data)
+{
+ struct bt_gatt_async_req *req = data;
+
+ bt_gatt_async_req_unref(req);
}
-static void discovery_op_complete(struct discovery_op *op, bool success,
+static void discovery_op_complete(struct bt_gatt_async_req *op, bool success,
uint8_t ecode)
{
if (op->callback)
@@ -606,13 +630,16 @@ static void discovery_op_complete(struct discovery_op *op, bool success,
op->user_data);
if (!op->id)
- discovery_op_unref(op);
+ async_req_unref(op);
+ else
+ op->id = 0;
+
}
static void read_by_grp_type_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
- struct discovery_op *op = user_data;
+ struct bt_gatt_async_req *op = user_data;
bool success;
uint8_t att_ecode = 0;
struct bt_gatt_result *cur_result;
@@ -673,8 +700,8 @@ static void read_by_grp_type_cb(uint8_t opcode, const void *pdu,
op->id = bt_att_send(op->att, BT_ATT_OP_READ_BY_GRP_TYPE_REQ,
pdu, sizeof(pdu),
read_by_grp_type_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return;
@@ -701,7 +728,7 @@ done:
static void find_by_type_val_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
- struct discovery_op *op = user_data;
+ struct bt_gatt_async_req *op = user_data;
bool success;
uint8_t att_ecode = 0;
uint16_t last_end;
@@ -749,8 +776,8 @@ static void find_by_type_val_cb(uint8_t opcode, const void *pdu,
op->id = bt_att_send(op->att, BT_ATT_OP_FIND_BY_TYPE_VAL_REQ,
pdu, sizeof(pdu),
find_by_type_val_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return;
@@ -765,21 +792,22 @@ done:
discovery_op_complete(op, success, att_ecode);
}
-static bool discover_services(struct bt_att *att, bt_uuid_t *uuid,
+static struct bt_gatt_async_req *discover_services(struct bt_att *att,
+ bt_uuid_t *uuid,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy,
bool primary)
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
if (!att)
- return false;
+ return NULL;
- op = new0(struct discovery_op, 1);
+ op = new0(struct bt_gatt_async_req, 1);
if (!op)
- return false;
+ return NULL;
op->att = att;
op->end_handle = end;
@@ -798,16 +826,16 @@ static bool discover_services(struct bt_att *att, bt_uuid_t *uuid,
put_le16(op->service_type, pdu + 4);
op->id = bt_att_send(att, BT_ATT_OP_READ_BY_GRP_TYPE_REQ,
- pdu, sizeof(pdu),
- read_by_grp_type_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ pdu, sizeof(pdu),
+ read_by_grp_type_cb,
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
} else {
uint8_t pdu[6 + get_uuid_len(uuid)];
if (uuid->type == BT_UUID_UNSPEC) {
free(op);
- return false;
+ return NULL;
}
/* Discover by UUID */
@@ -819,21 +847,22 @@ static bool discover_services(struct bt_att *att, bt_uuid_t *uuid,
bt_uuid_to_le(&op->uuid, pdu + 6);
op->id = bt_att_send(att, BT_ATT_OP_FIND_BY_TYPE_VAL_REQ,
- pdu, sizeof(pdu),
- find_by_type_val_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ pdu, sizeof(pdu),
+ find_by_type_val_cb,
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
}
if (!op->id) {
free(op);
- return false;
+ return NULL;
}
- return true;
+ return bt_gatt_async_req_ref(op);
}
-bool bt_gatt_discover_all_primary_services(struct bt_att *att, bt_uuid_t *uuid,
+struct bt_gatt_async_req *bt_gatt_discover_all_primary_services(
+ struct bt_att *att, bt_uuid_t *uuid,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
@@ -843,7 +872,8 @@ bool bt_gatt_discover_all_primary_services(struct bt_att *att, bt_uuid_t *uuid,
destroy);
}
-bool bt_gatt_discover_primary_services(struct bt_att *att, bt_uuid_t *uuid,
+struct bt_gatt_async_req *bt_gatt_discover_primary_services(
+ struct bt_att *att, bt_uuid_t *uuid,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
@@ -853,7 +883,8 @@ bool bt_gatt_discover_primary_services(struct bt_att *att, bt_uuid_t *uuid,
destroy, true);
}
-bool bt_gatt_discover_secondary_services(struct bt_att *att, bt_uuid_t *uuid,
+struct bt_gatt_async_req *bt_gatt_discover_secondary_services(
+ struct bt_att *att, bt_uuid_t *uuid,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
@@ -864,7 +895,7 @@ bool bt_gatt_discover_secondary_services(struct bt_att *att, bt_uuid_t *uuid,
}
struct read_incl_data {
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
struct bt_gatt_result *result;
int pos;
int ref_count;
@@ -878,7 +909,7 @@ static struct read_incl_data *new_read_included(struct bt_gatt_result *res)
if (!data)
return NULL;
- data->op = discovery_op_ref(res->op);
+ data->op = bt_gatt_async_req_ref(res->op);
data->result = res;
return data;
@@ -898,7 +929,7 @@ static void read_included_unref(void *data)
if (__sync_sub_and_fetch(&read_data->ref_count, 1))
return;
- discovery_op_unref(read_data->op);
+ async_req_unref(read_data->op);
free(read_data);
}
@@ -910,7 +941,7 @@ static void read_included_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
struct read_incl_data *data = user_data;
- struct discovery_op *op = data->op;
+ struct bt_gatt_async_req *op = data->op;
uint8_t att_ecode = 0;
uint8_t read_pdu[2];
bool success;
@@ -958,8 +989,8 @@ static void read_included_cb(uint8_t opcode, const void *pdu,
op->id = bt_att_send(op->att, BT_ATT_OP_READ_BY_TYPE_REQ,
pdu, sizeof(pdu),
discover_included_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return;
@@ -985,7 +1016,7 @@ done:
static void read_included(struct read_incl_data *data)
{
- struct discovery_op *op = data->op;
+ struct bt_gatt_async_req *op = data->op;
uint8_t pdu[2];
memcpy(pdu, data->result->pdu + 2, sizeof(uint16_t));
@@ -1007,7 +1038,7 @@ static void read_included(struct read_incl_data *data)
static void discover_included_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
- struct discovery_op *op = user_data;
+ struct bt_gatt_async_req *op = user_data;
struct bt_gatt_result *cur_result;
uint8_t att_ecode = 0;
uint16_t last_handle;
@@ -1076,10 +1107,10 @@ static void discover_included_cb(uint8_t opcode, const void *pdu,
put_le16(GATT_INCLUDE_UUID, pdu + 4);
op->id = bt_att_send(op->att, BT_ATT_OP_READ_BY_TYPE_REQ,
- pdu, sizeof(pdu),
- discover_included_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ pdu, sizeof(pdu),
+ discover_included_cb,
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return;
@@ -1094,19 +1125,19 @@ failed:
discovery_op_complete(op, success, att_ecode);
}
-bool bt_gatt_discover_included_services(struct bt_att *att,
+struct bt_gatt_async_req *bt_gatt_discover_included_services(struct bt_att *att,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
uint8_t pdu[6];
if (!att)
return false;
- op = new0(struct discovery_op, 1);
+ op = new0(struct bt_gatt_async_req, 1);
if (!op)
return false;
@@ -1121,19 +1152,20 @@ bool bt_gatt_discover_included_services(struct bt_att *att,
put_le16(GATT_INCLUDE_UUID, pdu + 4);
op->id = bt_att_send(att, BT_ATT_OP_READ_BY_TYPE_REQ, pdu, sizeof(pdu),
- discover_included_cb, discovery_op_ref(op),
- discovery_op_unref);
- if (op->id)
- return true;
+ discover_included_cb, bt_gatt_async_req_ref(op),
+ async_req_unref);
+ if (!op->id) {
+ free(op);
+ return NULL;
+ }
- free(op);
- return false;
+ return bt_gatt_async_req_ref(op);
}
static void discover_chrcs_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
- struct discovery_op *op = user_data;
+ struct bt_gatt_async_req *op = user_data;
bool success;
uint8_t att_ecode = 0;
size_t data_length;
@@ -1187,8 +1219,8 @@ static void discover_chrcs_cb(uint8_t opcode, const void *pdu,
op->id = bt_att_send(op->att, BT_ATT_OP_READ_BY_TYPE_REQ,
pdu, sizeof(pdu),
discover_chrcs_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return;
@@ -1203,19 +1235,19 @@ done:
discovery_op_complete(op, success, att_ecode);
}
-bool bt_gatt_discover_characteristics(struct bt_att *att,
+struct bt_gatt_async_req *bt_gatt_discover_characteristics(struct bt_att *att,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
uint8_t pdu[6];
if (!att)
return false;
- op = new0(struct discovery_op, 1);
+ op = new0(struct bt_gatt_async_req, 1);
if (!op)
return false;
@@ -1230,19 +1262,20 @@ bool bt_gatt_discover_characteristics(struct bt_att *att,
put_le16(GATT_CHARAC_UUID, pdu + 4);
op->id = bt_att_send(att, BT_ATT_OP_READ_BY_TYPE_REQ, pdu, sizeof(pdu),
- discover_chrcs_cb, discovery_op_ref(op),
- discovery_op_unref);
- if (op->id)
- return true;
+ discover_chrcs_cb, bt_gatt_async_req_ref(op),
+ async_req_unref);
+ if (!op->id) {
+ free(op);
+ return NULL;
+ }
- free(op);
- return false;
+ return bt_gatt_async_req_ref(op);
}
static void read_by_type_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
- struct discovery_op *op = user_data;
+ struct bt_gatt_async_req *op = user_data;
bool success;
uint8_t att_ecode = 0;
size_t data_length;
@@ -1290,8 +1323,8 @@ static void read_by_type_cb(uint8_t opcode, const void *pdu,
op->id = bt_att_send(op->att, BT_ATT_OP_READ_BY_TYPE_REQ,
pdu, sizeof(pdu),
read_by_type_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return;
@@ -1311,13 +1344,13 @@ bool bt_gatt_read_by_type(struct bt_att *att, uint16_t start, uint16_t end,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
uint8_t pdu[4 + get_uuid_len(uuid)];
if (!att || !uuid || uuid->type == BT_UUID_UNSPEC)
return false;
- op = new0(struct discovery_op, 1);
+ op = new0(struct bt_gatt_async_req, 1);
if (!op)
return false;
@@ -1333,8 +1366,8 @@ bool bt_gatt_read_by_type(struct bt_att *att, uint16_t start, uint16_t end,
bt_uuid_to_le(uuid, pdu + 4);
op->id = bt_att_send(att, BT_ATT_OP_READ_BY_TYPE_REQ, pdu, sizeof(pdu),
- read_by_type_cb, discovery_op_ref(op),
- discovery_op_unref);
+ read_by_type_cb, bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return true;
@@ -1345,7 +1378,7 @@ bool bt_gatt_read_by_type(struct bt_att *att, uint16_t start, uint16_t end,
static void discover_descs_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
- struct discovery_op *op = user_data;
+ struct bt_gatt_async_req *op = user_data;
bool success;
uint8_t att_ecode = 0;
uint8_t format;
@@ -1405,8 +1438,8 @@ static void discover_descs_cb(uint8_t opcode, const void *pdu,
op->id = bt_att_send(op->att, BT_ATT_OP_FIND_INFO_REQ,
pdu, sizeof(pdu),
discover_descs_cb,
- discovery_op_ref(op),
- discovery_op_unref);
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
if (op->id)
return;
@@ -1421,19 +1454,19 @@ done:
discovery_op_complete(op, success, att_ecode);
}
-bool bt_gatt_discover_descriptors(struct bt_att *att,
+struct bt_gatt_async_req *bt_gatt_discover_descriptors(struct bt_att *att,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
- struct discovery_op *op;
+ struct bt_gatt_async_req *op;
uint8_t pdu[4];
if (!att)
return false;
- op = new0(struct discovery_op, 1);
+ op = new0(struct bt_gatt_async_req, 1);
if (!op)
return false;
@@ -1448,11 +1481,12 @@ bool bt_gatt_discover_descriptors(struct bt_att *att,
op->id = bt_att_send(att, BT_ATT_OP_FIND_INFO_REQ, pdu, sizeof(pdu),
discover_descs_cb,
- discovery_op_ref(op),
- discovery_op_unref);
- if (op->id)
- return true;
+ bt_gatt_async_req_ref(op),
+ async_req_unref);
+ if (!op->id) {
+ free(op);
+ return NULL;
+ }
- free(op);
- return false;
+ return bt_gatt_async_req_ref(op);
}
diff --git a/src/shared/gatt-helpers.h b/src/shared/gatt-helpers.h
index 0217e82..034941e 100644
--- a/src/shared/gatt-helpers.h
+++ b/src/shared/gatt-helpers.h
@@ -65,36 +65,45 @@ typedef void (*bt_gatt_discovery_callback_t)(bool success, uint8_t att_ecode,
struct bt_gatt_result *result,
void *user_data);
-bool bt_gatt_exchange_mtu(struct bt_att *att, uint16_t client_rx_mtu,
+struct bt_gatt_async_req;
+
+struct bt_gatt_async_req *bt_gatt_async_req_ref(struct bt_gatt_async_req *req);
+void bt_gatt_async_req_unref(struct bt_gatt_async_req *req);
+void bt_gatt_async_req_cancel(struct bt_gatt_async_req *req);
+
+unsigned int bt_gatt_exchange_mtu(struct bt_att *att, uint16_t client_rx_mtu,
bt_gatt_result_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy);
-bool bt_gatt_discover_all_primary_services(struct bt_att *att, bt_uuid_t *uuid,
+struct bt_gatt_async_req *bt_gatt_discover_all_primary_services(
+ struct bt_att *att, bt_uuid_t *uuid,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy);
-bool bt_gatt_discover_primary_services(struct bt_att *att, bt_uuid_t *uuid,
+struct bt_gatt_async_req *bt_gatt_discover_primary_services(
+ struct bt_att *att, bt_uuid_t *uuid,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy);
-bool bt_gatt_discover_secondary_services(struct bt_att *att, bt_uuid_t *uuid,
+struct bt_gatt_async_req *bt_gatt_discover_secondary_services(
+ struct bt_att *att, bt_uuid_t *uuid,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy);
-bool bt_gatt_discover_included_services(struct bt_att *att,
+struct bt_gatt_async_req *bt_gatt_discover_included_services(struct bt_att *att,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy);
-bool bt_gatt_discover_characteristics(struct bt_att *att,
+struct bt_gatt_async_req *bt_gatt_discover_characteristics(struct bt_att *att,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy);
-bool bt_gatt_discover_descriptors(struct bt_att *att,
+struct bt_gatt_async_req *bt_gatt_discover_descriptors(struct bt_att *att,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
--
2.2.0.rc0.207.ga3a616c
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
