linux-kernel - [PATCH] Bluetooth: btrtl: Add null check in setup

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Date:   Tue, 22 Dec 2020 18:48:24 -0800
From:   Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To:     marcel@...tmann.org
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        linux-bluetooth@...r.kernel.org,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Daniel Winkler <danielwinkler@...gle.com>,
        linux-kernel@...r.kernel.org,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>
Subject: [PATCH] Bluetooth: btrtl: Add null check in setup

btrtl_dev->ic_info is only available from the controller on cold boot
(the lmp subversion matches the device model and this is used to look up
the ic_info). On warm boots (firmware already loaded),
btrtl_dev->ic_info is null.

Fixes: 05672a2c14a4 (Bluetooth: btrtl: Enable central-peripheral role)
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---

 drivers/bluetooth/btrtl.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 1abf6a4d672734f..978f3c773856b05 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -719,16 +719,19 @@ int btrtl_setup_realtek(struct hci_dev *hdev)
 	 */
 	set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
 
-	/* Enable central-peripheral role (able to create new connections with
-	 * an existing connection in slave role).
-	 */
-	switch (btrtl_dev->ic_info->lmp_subver) {
-	case RTL_ROM_LMP_8822B:
-		set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
-		break;
-	default:
-		rtl_dev_dbg(hdev, "Central-peripheral role not enabled.");
-		break;
+	if (btrtl_dev->ic_info) {
+		/* Enable central-peripheral role (able to create new
+		 * connections with an existing connection in slave role).
+		 */
+		switch (btrtl_dev->ic_info->lmp_subver) {
+		case RTL_ROM_LMP_8822B:
+			set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
+			break;
+		default:
+			rtl_dev_dbg(hdev,
+				    "Central-peripheral role not enabled.");
+			break;
+		}
 	}
 
 	btrtl_free(btrtl_dev);
-- 
2.29.2.729.g45daf8777d-goog