From dff6d593b10fc04a24e07650c459947e9d6ff3c3 Mon Sep 17 00:00:00 2001 From: Andrea Parri Date: Tue, 27 Nov 2018 12:22:25 +0100 Subject: [PATCH] Bluetooth: Remove unnecessary smp_mb__after_atomic() barriers 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 Signed-off-by: Marcel Holtmann --- drivers/bluetooth/btusb.c | 8 ++------ drivers/bluetooth/hci_intel.c | 16 ++++------------ 2 files changed, 6 insertions(+), 18 deletions(-) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 7439a7eb50ac..885e17a1a9a5 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -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) diff --git a/drivers/bluetooth/hci_intel.c b/drivers/bluetooth/hci_intel.c index 46ace321bf60..8caa1a6619ce 100644 --- a/drivers/bluetooth/hci_intel.c +++ b/drivers/bluetooth/hci_intel.c @@ -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);