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Bluetooth: Remove unnecessary smp_mb__after_atomic() barriers

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The barriers are redundant because atomic_test_and_clear_bit() already
provides the required full ordering for the cases in question (that is,
when the bit is cleared).

Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Andrea Parri 2018-11-27 12:22:25 +01:00 committed by Marcel Holtmann
parent 0697607aca
commit dff6d593b1
2 changed files with 6 additions and 18 deletions
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8
drivers/bluetooth/btusb.c
View File

@ -1935,10 +1935,8 @@ static void btusb_intel_bootup(struct btusb_data *data, const void *ptr,
if (len != sizeof(*evt))
return;
if (test_and_clear_bit(BTUSB_BOOTING, &data->flags)) {
smp_mb__after_atomic();
if (test_and_clear_bit(BTUSB_BOOTING, &data->flags))
wake_up_bit(&data->flags, BTUSB_BOOTING);
}
}
static void btusb_intel_secure_send_result(struct btusb_data *data,
@ -1953,10 +1951,8 @@ static void btusb_intel_secure_send_result(struct btusb_data *data,
set_bit(BTUSB_FIRMWARE_FAILED, &data->flags);
if (test_and_clear_bit(BTUSB_DOWNLOADING, &data->flags) &&
test_bit(BTUSB_FIRMWARE_LOADED, &data->flags)) {
smp_mb__after_atomic();
test_bit(BTUSB_FIRMWARE_LOADED, &data->flags))
wake_up_bit(&data->flags, BTUSB_DOWNLOADING);
}
}
static int btusb_recv_event_intel(struct hci_dev *hdev, struct sk_buff *skb)

16
drivers/bluetooth/hci_intel.c
View File

@ -909,10 +909,8 @@ static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
set_bit(STATE_FIRMWARE_FAILED, &intel->flags);
if (test_and_clear_bit(STATE_DOWNLOADING, &intel->flags) &&
test_bit(STATE_FIRMWARE_LOADED, &intel->flags)) {
smp_mb__after_atomic();
test_bit(STATE_FIRMWARE_LOADED, &intel->flags))
wake_up_bit(&intel->flags, STATE_DOWNLOADING);
}
/* When switching to the operational firmware the device
* sends a vendor specific event indicating that the bootup
@ -920,10 +918,8 @@ static int intel_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
*/
} else if (skb->len == 9 && hdr->evt == 0xff && hdr->plen == 0x07 &&
skb->data[2] == 0x02) {
if (test_and_clear_bit(STATE_BOOTING, &intel->flags)) {
smp_mb__after_atomic();
if (test_and_clear_bit(STATE_BOOTING, &intel->flags))
wake_up_bit(&intel->flags, STATE_BOOTING);
}
}
recv:
return hci_recv_frame(hdev, skb);
@ -960,17 +956,13 @@ static int intel_recv_lpm(struct hci_dev *hdev, struct sk_buff *skb)
break;
case LPM_OP_SUSPEND_ACK:
set_bit(STATE_SUSPENDED, &intel->flags);
if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags)) {
smp_mb__after_atomic();
if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags))
wake_up_bit(&intel->flags, STATE_LPM_TRANSACTION);
}
break;
case LPM_OP_RESUME_ACK:
clear_bit(STATE_SUSPENDED, &intel->flags);
if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags)) {
smp_mb__after_atomic();
if (test_and_clear_bit(STATE_LPM_TRANSACTION, &intel->flags))
wake_up_bit(&intel->flags, STATE_LPM_TRANSACTION);
}
break;
default:
bt_dev_err(hdev, "Unknown LPM opcode (%02x)", lpm->opcode);