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Date:   Mon, 16 Mar 2020 22:40:27 -0700
Message-Id: <20200316224023.1.I002569822232363cfbb5af1f33a293ea390c24c7@changeid>
Mime-Version: 1.0
Subject: [PATCH] Bluetooth: Do not cancel advertising when starting a scan
From:   Manish Mandlik <mmandlik@google.com>
To:     marcel@holtmann.org
Cc:     Yoni Shavit <yshavit@chromium.org>,
        Alain Michaud <alainm@chromium.org>,
        Miao-chen Chou <mcchou@chromium.org>,
        linux-bluetooth@vger.kernel.org,
        Dmitry Grinberg <dmitrygr@google.com>,
        Manish Mandlik <mmandlik@google.com>,
        "David S. Miller" <davem@davemloft.net>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jakub Kicinski <kuba@kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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From: Dmitry Grinberg <dmitrygr@google.com>

BlueZ cancels adv when starting a scan, but does not cancel a scan when
starting to adv. Neither is required, so this brings both to a
consistent state (of not affecting each other). Some very rare (I've
never seen one) BT 4.0 chips will fail to do both at once. Even this is
ok since the command that will fail will be the second one, and thus the
common sense logic of first-come-first-served is preserved for BLE
requests.

Signed-off-by: Dmitry Grinberg <dmitrygr@google.com>
Signed-off-by: Manish Mandlik <mmandlik@google.com>
---

 net/bluetooth/hci_request.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index bf83179ab9d19..649e1e5ed446a 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -2727,23 +2727,6 @@ static int active_scan(struct hci_request *req, unsigned long opt)
 
 	BT_DBG("%s", hdev->name);
 
-	if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
-		hci_dev_lock(hdev);
-
-		/* Don't let discovery abort an outgoing connection attempt
-		 * that's using directed advertising.
-		 */
-		if (hci_lookup_le_connect(hdev)) {
-			hci_dev_unlock(hdev);
-			return -EBUSY;
-		}
-
-		cancel_adv_timeout(hdev);
-		hci_dev_unlock(hdev);
-
-		__hci_req_disable_advertising(req);
-	}
-
 	/* If controller is scanning, it means the background scanning is
 	 * running. Thus, we should temporarily stop it in order to set the
 	 * discovery scanning parameters.
-- 
2.25.1.481.gfbce0eb801-goog