[PATCH] Bluetooth: btmrvl: avoid sending data to firmware after hs_activated

[Bing Zhao <bzhao@xxxxxxxxxxx>]

From: Chin-Ran Lo <crlo@xxxxxxxxxxx>

We should suspend hci device and purge remaining data in tx queue
before enabling host sleep in firmware. If any data is sent to
firmware after host sleep is activated, firmware may end up
sending a TX_DONE interrupt to driver. If this interrupt gets
delivered to host while the SDIO host controller is suspending,
it may crash the system.

Conversely, in resume handler, we should resume hci device after
host sleep is de-activated.

Signed-off-by: Chin-Ran Lo <crlo@xxxxxxxxxxx>
Signed-off-by: Bing Zhao <bzhao@xxxxxxxxxxx>
---
 drivers/bluetooth/btmrvl_sdio.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/bluetooth/btmrvl_sdio.c b/drivers/bluetooth/btmrvl_sdio.c
index efff064..3e683b1 100644
--- a/drivers/bluetooth/btmrvl_sdio.c
+++ b/drivers/bluetooth/btmrvl_sdio.c
@@ -1169,6 +1169,10 @@ static int btmrvl_sdio_suspend(struct device *dev)
 	}
 
 	priv = card->priv;
+	hcidev = priv->btmrvl_dev.hcidev;
+	BT_DBG("%s: SDIO suspend", hcidev->name);
+	hci_suspend_dev(hcidev);
+	skb_queue_purge(&priv->adapter->tx_queue);
 
 	if (priv->adapter->hs_state != HS_ACTIVATED) {
 		if (btmrvl_enable_hs(priv)) {
@@ -1176,10 +1180,6 @@ static int btmrvl_sdio_suspend(struct device *dev)
 			return -EBUSY;
 		}
 	}
-	hcidev = priv->btmrvl_dev.hcidev;
-	BT_DBG("%s: SDIO suspend", hcidev->name);
-	hci_suspend_dev(hcidev);
-	skb_queue_purge(&priv->adapter->tx_queue);
 
 	priv->adapter->is_suspended = true;
 
@@ -1221,13 +1221,13 @@ static int btmrvl_sdio_resume(struct device *dev)
 		return 0;
 	}
 
-	priv->adapter->is_suspended = false;
-	hcidev = priv->btmrvl_dev.hcidev;
-	BT_DBG("%s: SDIO resume", hcidev->name);
-	hci_resume_dev(hcidev);
 	priv->hw_wakeup_firmware(priv);
 	priv->adapter->hs_state = HS_DEACTIVATED;
+	hcidev = priv->btmrvl_dev.hcidev;
 	BT_DBG("%s: HS DEACTIVATED in resume!", hcidev->name);
+	priv->adapter->is_suspended = false;
+	BT_DBG("%s: SDIO resume", hcidev->name);
+	hci_resume_dev(hcidev);
 
 	return 0;
 }
-- 
1.8.2.3

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