After checking the discovery state, if other thread modifies it
then it will be overwritten by the assignment in the first thread.
Signed-off-by: Jaganath Kanakkassery <[email protected]>
---
net/bluetooth/hci_event.c | 9 ++++-----
net/bluetooth/mgmt.c | 4 ----
2 files changed, 4 insertions(+), 9 deletions(-)
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 705078a..97b4828 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1273,14 +1273,13 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
+ hci_dev_lock(hdev);
if (hdev->discovery.type == DISCOV_TYPE_INTERLEAVED &&
- hdev->discovery.state == DISCOVERY_FINDING) {
+ hdev->discovery.state == DISCOVERY_FINDING)
mgmt_interleaved_discovery(hdev);
- } else {
- hci_dev_lock(hdev);
+ else
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
- hci_dev_unlock(hdev);
- }
+ hci_dev_unlock(hdev);
break;
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index e5502a5..bcc7080 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2298,14 +2298,10 @@ int mgmt_interleaved_discovery(struct hci_dev *hdev)
BT_DBG("%s", hdev->name);
- hci_dev_lock(hdev);
-
err = hci_do_inquiry(hdev, INQUIRY_LEN_BREDR_LE);
if (err < 0)
hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
- hci_dev_unlock(hdev);
-
return err;
}
--
1.7.9.5
Hi Marcel,
--------------------------------------------------
From: "Marcel Holtmann" <[email protected]>
Sent: Tuesday, January 15, 2013 9:47 PM
To: "Jaganath Kanakkassery" <[email protected]>
Cc: <[email protected]>
Subject: Re: [PATCH v3 3/3] Bluetooth: Fix stop discovery while in STARTING
state
> Hi Jaganath,
>
>> If stop_discovery() is called when discovery state is STARTING, it
>> will be failed currently. This patch fixes this.
>>
>> Signed-off-by: Jaganath Kanakkassery <[email protected]>
>> ---
>> include/net/bluetooth/hci_core.h | 1 +
>> net/bluetooth/hci_event.c | 14 ++++++++++++--
>> net/bluetooth/mgmt.c | 12 +++++++++++-
>> 3 files changed, 24 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/net/bluetooth/hci_core.h
>> b/include/net/bluetooth/hci_core.h
>> index d8f68c7..01c723a 100644
>> --- a/include/net/bluetooth/hci_core.h
>> +++ b/include/net/bluetooth/hci_core.h
>> @@ -64,6 +64,7 @@ struct discovery_state {
>> DISCOVERY_RESOLVING,
>> DISCOVERY_STOPPING,
>> } state;
>> + u8 discovering;
>
> what is this double spaces for? And why not a bool. Or a better name.
I just followed the type of "discovering" in mgmt_discovering(). I am not
sure why it is u8 and not bool since the possible values are only 0 and 1.
If you are ok with bool I will raise a separate patch to first change the
type
of discovering in mgmt_discovering() and also in struct mgmt_ev_discovering.
>> struct list_head all; /* All devices found during inquiry */
>> struct list_head unknown; /* Name state not known */
>> struct list_head resolve; /* Name needs to be resolved */
>> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
>> index 97b4828..c616cbf 100644
>> --- a/net/bluetooth/hci_event.c
>> +++ b/net/bluetooth/hci_event.c
>> @@ -1259,7 +1259,12 @@ static void hci_cc_le_set_scan_enable(struct
>> hci_dev *hdev,
>> set_bit(HCI_LE_SCAN, &hdev->dev_flags);
>>
>> hci_dev_lock(hdev);
>> - hci_discovery_set_state(hdev, DISCOVERY_FINDING);
>> + if (hdev->discovery.state == DISCOVERY_STOPPING) {
>> + hci_cancel_le_scan(hdev);
>> + mgmt_start_discovery_cancelled(hdev);
>> + } else {
>> + hci_discovery_set_state(hdev, DISCOVERY_FINDING);
>> + }
>> hci_dev_unlock(hdev);
>> break;
>>
>> @@ -1375,7 +1380,12 @@ static void hci_cs_inquiry(struct hci_dev *hdev,
>> __u8 status)
>> set_bit(HCI_INQUIRY, &hdev->flags);
>>
>> hci_dev_lock(hdev);
>> - hci_discovery_set_state(hdev, DISCOVERY_FINDING);
>> + if (hdev->discovery.state == DISCOVERY_STOPPING) {
>> + hci_cancel_inquiry(hdev);
>> + mgmt_start_discovery_cancelled(hdev);
>> + } else {
>> + hci_discovery_set_state(hdev, DISCOVERY_FINDING);
>> + }
>> hci_dev_unlock(hdev);
>> }
>>
>> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
>> index 0db9d66..6dc275f 100644
>> --- a/net/bluetooth/mgmt.c
>> +++ b/net/bluetooth/mgmt.c
>> @@ -2394,7 +2394,8 @@ static int stop_discovery(struct sock *sk, struct
>> hci_dev *hdev, void *data,
>>
>> hci_dev_lock(hdev);
>>
>> - if (!hci_discovery_active(hdev)) {
>> + if (hdev->discovery.state != DISCOVERY_STARTING &&
>> + !hci_discovery_active(hdev)) {
>> err = cmd_complete(sk, hdev->id, MGMT_OP_STOP_DISCOVERY,
>> MGMT_STATUS_REJECTED, &mgmt_cp->type,
>> sizeof(mgmt_cp->type));
>> @@ -2442,6 +2443,10 @@ static int stop_discovery(struct sock *sk, struct
>> hci_dev *hdev, void *data,
>>
>> break;
>>
>> + case DISCOVERY_STARTING:
>> + err = 0;
>> + break;
>> +
>> default:
>> BT_DBG("unknown discovery state %u", hdev->discovery.state);
>> err = -EFAULT;
>> @@ -3720,6 +3725,11 @@ int mgmt_discovering(struct hci_dev *hdev, u8
>> discovering)
>> mgmt_pending_remove(cmd);
>> }
>>
>> + if (hdev->discovery.discovering == discovering)
>> + return 0;
>> +
>> + hdev->discovery.discovering = discovering;
>> +
>> memset(&ev, 0, sizeof(ev));
>> ev.type = hdev->discovery.type;
>> ev.discovering = discovering;
>
Thanks,
Jaganath
Hi Jaganath,
> If stop_discovery() is called when discovery state is STARTING, it
> will be failed currently. This patch fixes this.
>
> Signed-off-by: Jaganath Kanakkassery <[email protected]>
> ---
> include/net/bluetooth/hci_core.h | 1 +
> net/bluetooth/hci_event.c | 14 ++++++++++++--
> net/bluetooth/mgmt.c | 12 +++++++++++-
> 3 files changed, 24 insertions(+), 3 deletions(-)
>
> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
> index d8f68c7..01c723a 100644
> --- a/include/net/bluetooth/hci_core.h
> +++ b/include/net/bluetooth/hci_core.h
> @@ -64,6 +64,7 @@ struct discovery_state {
> DISCOVERY_RESOLVING,
> DISCOVERY_STOPPING,
> } state;
> + u8 discovering;
what is this double spaces for? And why not a bool. Or a better name.
> struct list_head all; /* All devices found during inquiry */
> struct list_head unknown; /* Name state not known */
> struct list_head resolve; /* Name needs to be resolved */
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 97b4828..c616cbf 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -1259,7 +1259,12 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
> set_bit(HCI_LE_SCAN, &hdev->dev_flags);
>
> hci_dev_lock(hdev);
> - hci_discovery_set_state(hdev, DISCOVERY_FINDING);
> + if (hdev->discovery.state == DISCOVERY_STOPPING) {
> + hci_cancel_le_scan(hdev);
> + mgmt_start_discovery_cancelled(hdev);
> + } else {
> + hci_discovery_set_state(hdev, DISCOVERY_FINDING);
> + }
> hci_dev_unlock(hdev);
> break;
>
> @@ -1375,7 +1380,12 @@ static void hci_cs_inquiry(struct hci_dev *hdev, __u8 status)
> set_bit(HCI_INQUIRY, &hdev->flags);
>
> hci_dev_lock(hdev);
> - hci_discovery_set_state(hdev, DISCOVERY_FINDING);
> + if (hdev->discovery.state == DISCOVERY_STOPPING) {
> + hci_cancel_inquiry(hdev);
> + mgmt_start_discovery_cancelled(hdev);
> + } else {
> + hci_discovery_set_state(hdev, DISCOVERY_FINDING);
> + }
> hci_dev_unlock(hdev);
> }
>
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index 0db9d66..6dc275f 100644
> --- a/net/bluetooth/mgmt.c
> +++ b/net/bluetooth/mgmt.c
> @@ -2394,7 +2394,8 @@ static int stop_discovery(struct sock *sk, struct hci_dev *hdev, void *data,
>
> hci_dev_lock(hdev);
>
> - if (!hci_discovery_active(hdev)) {
> + if (hdev->discovery.state != DISCOVERY_STARTING &&
> + !hci_discovery_active(hdev)) {
> err = cmd_complete(sk, hdev->id, MGMT_OP_STOP_DISCOVERY,
> MGMT_STATUS_REJECTED, &mgmt_cp->type,
> sizeof(mgmt_cp->type));
> @@ -2442,6 +2443,10 @@ static int stop_discovery(struct sock *sk, struct hci_dev *hdev, void *data,
>
> break;
>
> + case DISCOVERY_STARTING:
> + err = 0;
> + break;
> +
> default:
> BT_DBG("unknown discovery state %u", hdev->discovery.state);
> err = -EFAULT;
> @@ -3720,6 +3725,11 @@ int mgmt_discovering(struct hci_dev *hdev, u8 discovering)
> mgmt_pending_remove(cmd);
> }
>
> + if (hdev->discovery.discovering == discovering)
> + return 0;
> +
> + hdev->discovery.discovering = discovering;
> +
> memset(&ev, 0, sizeof(ev));
> ev.type = hdev->discovery.type;
> ev.discovering = discovering;
Regards
Marcel
If stop_discovery() is called when discovery state is STARTING, it
will be failed currently. This patch fixes this.
Signed-off-by: Jaganath Kanakkassery <[email protected]>
---
include/net/bluetooth/hci_core.h | 1 +
net/bluetooth/hci_event.c | 14 ++++++++++++--
net/bluetooth/mgmt.c | 12 +++++++++++-
3 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index d8f68c7..01c723a 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -64,6 +64,7 @@ struct discovery_state {
DISCOVERY_RESOLVING,
DISCOVERY_STOPPING,
} state;
+ u8 discovering;
struct list_head all; /* All devices found during inquiry */
struct list_head unknown; /* Name state not known */
struct list_head resolve; /* Name needs to be resolved */
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 97b4828..c616cbf 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1259,7 +1259,12 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
set_bit(HCI_LE_SCAN, &hdev->dev_flags);
hci_dev_lock(hdev);
- hci_discovery_set_state(hdev, DISCOVERY_FINDING);
+ if (hdev->discovery.state == DISCOVERY_STOPPING) {
+ hci_cancel_le_scan(hdev);
+ mgmt_start_discovery_cancelled(hdev);
+ } else {
+ hci_discovery_set_state(hdev, DISCOVERY_FINDING);
+ }
hci_dev_unlock(hdev);
break;
@@ -1375,7 +1380,12 @@ static void hci_cs_inquiry(struct hci_dev *hdev, __u8 status)
set_bit(HCI_INQUIRY, &hdev->flags);
hci_dev_lock(hdev);
- hci_discovery_set_state(hdev, DISCOVERY_FINDING);
+ if (hdev->discovery.state == DISCOVERY_STOPPING) {
+ hci_cancel_inquiry(hdev);
+ mgmt_start_discovery_cancelled(hdev);
+ } else {
+ hci_discovery_set_state(hdev, DISCOVERY_FINDING);
+ }
hci_dev_unlock(hdev);
}
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 0db9d66..6dc275f 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2394,7 +2394,8 @@ static int stop_discovery(struct sock *sk, struct hci_dev *hdev, void *data,
hci_dev_lock(hdev);
- if (!hci_discovery_active(hdev)) {
+ if (hdev->discovery.state != DISCOVERY_STARTING &&
+ !hci_discovery_active(hdev)) {
err = cmd_complete(sk, hdev->id, MGMT_OP_STOP_DISCOVERY,
MGMT_STATUS_REJECTED, &mgmt_cp->type,
sizeof(mgmt_cp->type));
@@ -2442,6 +2443,10 @@ static int stop_discovery(struct sock *sk, struct hci_dev *hdev, void *data,
break;
+ case DISCOVERY_STARTING:
+ err = 0;
+ break;
+
default:
BT_DBG("unknown discovery state %u", hdev->discovery.state);
err = -EFAULT;
@@ -3720,6 +3725,11 @@ int mgmt_discovering(struct hci_dev *hdev, u8 discovering)
mgmt_pending_remove(cmd);
}
+ if (hdev->discovery.discovering == discovering)
+ return 0;
+
+ hdev->discovery.discovering = discovering;
+
memset(&ev, 0, sizeof(ev));
ev.type = hdev->discovery.type;
ev.discovering = discovering;
--
1.7.9.5
This function can be used to inform userspace that start discovery
is cancelled
Signed-off-by: Jaganath Kanakkassery <[email protected]>
---
include/net/bluetooth/hci_core.h | 1 +
net/bluetooth/mgmt.c | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 014a2ea..d8f68c7 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1112,6 +1112,7 @@ int mgmt_device_found(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
int mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
u8 addr_type, s8 rssi, u8 *name, u8 name_len);
int mgmt_start_discovery_failed(struct hci_dev *hdev, u8 status);
+int mgmt_start_discovery_cancelled(struct hci_dev *hdev);
int mgmt_stop_discovery_failed(struct hci_dev *hdev, u8 status);
int mgmt_discovering(struct hci_dev *hdev, u8 discovering);
int mgmt_interleaved_discovery(struct hci_dev *hdev);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index bcc7080..0db9d66 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -3665,6 +3665,25 @@ int mgmt_start_discovery_failed(struct hci_dev *hdev, u8 status)
return err;
}
+int mgmt_start_discovery_cancelled(struct hci_dev *hdev)
+{
+ struct pending_cmd *cmd;
+ u8 type;
+ int err;
+
+ cmd = mgmt_pending_find(MGMT_OP_START_DISCOVERY, hdev);
+ if (!cmd)
+ return -ENOENT;
+
+ type = hdev->discovery.type;
+
+ err = cmd_complete(cmd->sk, hdev->id, cmd->opcode, MGMT_STATUS_CANCELLED,
+ &type, sizeof(type));
+ mgmt_pending_remove(cmd);
+
+ return err;
+}
+
int mgmt_stop_discovery_failed(struct hci_dev *hdev, u8 status)
{
struct pending_cmd *cmd;
--
1.7.9.5