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Bluetooth: btmrvl: wait for HOST_SLEEP_ENABLE event in suspend 

After BT_CMD_HOST_SLEEP_ENABLE command finishes, driver should
wait until getting BT_EVENT_HOST_SLEEP_ENABLE event to complete
suspend procedure.
Without this patch the suspend handler would return success
earlier. By the time when the BT_EVENT_HOST_SLEEP_ENABLE event
comes in the controller driver could have already turned off the
bus clock. This causes kernel crash or system reboot eventually.

Cc: <stable@vger.kernel.org> # 3.13+
Signed-off-by: Chin-Ran Lo <crlo@marvell.com>
Signed-off-by: Jeff CF Chen <jeffc@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Chin-Ran Lo 2014-07-01 14:00:14 -07:00 committed by Marcel Holtmann
parent 4df82b5911
commit 396e04f4bb
2 changed files with 25 additions and 1 deletions
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1
drivers/bluetooth/btmrvl_drv.h
View File

@ -68,6 +68,7 @@ struct btmrvl_adapter {
u8 hs_state;
u8 wakeup_tries;
wait_queue_head_t cmd_wait_q;
wait_queue_head_t event_hs_wait_q;
u8 cmd_complete;
bool is_suspended;
};

25
drivers/bluetooth/btmrvl_main.c
View File

@ -114,6 +114,7 @@ int btmrvl_process_event(struct btmrvl_private *priv, struct sk_buff *skb)
adapter->hs_state = HS_ACTIVATED;
if (adapter->psmode)
adapter->ps_state = PS_SLEEP;
wake_up_interruptible(&adapter->event_hs_wait_q);
BT_DBG("HS ACTIVATED!");
} else {
BT_DBG("HS Enable failed");
@ -270,11 +271,31 @@ EXPORT_SYMBOL_GPL(btmrvl_enable_ps);
int btmrvl_enable_hs(struct btmrvl_private *priv)
{
struct btmrvl_adapter *adapter = priv->adapter;
int ret;
ret = btmrvl_send_sync_cmd(priv, BT_CMD_HOST_SLEEP_ENABLE, NULL, 0);
if (ret)
if (ret) {
BT_ERR("Host sleep enable command failed\n");
return ret;
}
ret = wait_event_interruptible_timeout(adapter->event_hs_wait_q,
adapter->hs_state,
msecs_to_jiffies(WAIT_UNTIL_HS_STATE_CHANGED));
if (ret < 0) {
BT_ERR("event_hs_wait_q terminated (%d): %d,%d,%d",
ret, adapter->hs_state, adapter->ps_state,
adapter->wakeup_tries);
} else if (!ret) {
BT_ERR("hs_enable timeout: %d,%d,%d", adapter->hs_state,
adapter->ps_state, adapter->wakeup_tries);
ret = -ETIMEDOUT;
} else {
BT_DBG("host sleep enabled: %d,%d,%d", adapter->hs_state,
adapter->ps_state, adapter->wakeup_tries);
ret = 0;
}
return ret;
}
@ -375,6 +396,7 @@ static void btmrvl_init_adapter(struct btmrvl_private *priv)
}
init_waitqueue_head(&priv->adapter->cmd_wait_q);
init_waitqueue_head(&priv->adapter->event_hs_wait_q);
}
static void btmrvl_free_adapter(struct btmrvl_private *priv)
@ -685,6 +707,7 @@ int btmrvl_remove_card(struct btmrvl_private *priv)
hdev = priv->btmrvl_dev.hcidev;
wake_up_interruptible(&priv->adapter->cmd_wait_q);
wake_up_interruptible(&priv->adapter->event_hs_wait_q);
kthread_stop(priv->main_thread.task);