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[PATCH] Bluetooth: hci_qca: Fix crash with non-serdev devices

qca_set_baudrate() calls serdev_device_wait_until_sent() assuming that
the HCI is always associated with a serdev device. This isn't true for
ROME controllers instantiated through ldisc, where the call causes a
crash due to a NULL pointer dereferentiation. Only call the function
when we have a serdev device. The timeout for ROME devices at the end
of qca_set_baudrate() is long enough to be reasonably sure that the
command was sent.

Fixes: fa9ad876b8e0 ("Bluetooth: hci_qca: Add support for Qualcomm
Bluetooth chip wcn3990")
Reported-by: Balakrishna Godavarthi <bgodavar@xxxxxxxxxxxxxx>
Reported-by: Rocky Liao <rjliao@xxxxxxxxxxxxxx>
Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
 drivers/bluetooth/hci_qca.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 4ea995d610d2..714a6a16f9d5 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1004,7 +1004,8 @@ static int qca_set_baudrate(struct hci_dev
*hdev, uint8_t baudrate)
 	while (!skb_queue_empty(&qca->txq))
 		usleep_range(100, 200);

-	serdev_device_wait_until_sent(hu->serdev,
+	if (hu->serdev)
+		serdev_device_wait_until_sent(hu->serdev,

 	/* Give the controller time to process the request */