linux-kernel - [PATCH 3.16 029/148] Bluetooth: hci_core: fix init for HCI_USER

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Date:   Sat, 08 Feb 2020 18:19:28 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Marcel Holtmann" <marcel@...tmann.org>,
        "Mattijs Korpershoek" <mkorpershoek@...libre.com>
Subject: [PATCH 3.16 029/148] Bluetooth: hci_core: fix init for
 HCI_USER_CHANNEL

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Mattijs Korpershoek <mkorpershoek@...libre.com>

commit eb8c101e28496888a0dcfe16ab86a1bee369e820 upstream.

During the setup() stage, HCI device drivers expect the chip to
acknowledge its setup() completion via vendor specific frames.

If userspace opens() such HCI device in HCI_USER_CHANNEL [1] mode,
the vendor specific frames are never tranmitted to the driver, as
they are filtered in hci_rx_work().

Allow HCI devices which operate in HCI_USER_CHANNEL mode to receive
frames if the HCI device is is HCI_INIT state.

[1] https://www.spinics.net/lists/linux-bluetooth/msg37345.html

Fixes: 23500189d7e0 ("Bluetooth: Introduce new HCI socket channel for user operation")
Signed-off-by: Mattijs Korpershoek <mkorpershoek@...libre.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
[bwh: Backported to 3.16: Keep checking both HCI_RAW and HCI_USER_CHANNEL
 bits here]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -5226,8 +5226,15 @@ static void hci_rx_work(struct work_stru
 			hci_send_to_sock(hdev, skb);
 		}
 
-		if (test_bit(HCI_RAW, &hdev->flags) ||
-		    test_bit(HCI_USER_CHANNEL, &hdev->dev_flags)) {
+		/* If the device has been opened in HCI_USER_CHANNEL,
+		 * the userspace has exclusive access to device.
+		 * When device is HCI_INIT, we still need to process
+		 * the data packets to the driver in order
+		 * to complete its setup().
+		 */
+		if ((test_bit(HCI_RAW, &hdev->flags) ||
+		     test_bit(HCI_USER_CHANNEL, &hdev->dev_flags)) &&
+		    !test_bit(HCI_INIT, &hdev->flags)) {
 			kfree_skb(skb);
 			continue;
 		}