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Bluetooth: hci_qca: Fix crash with non-serdev devices

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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@codeaurora.org>
Reported-by: Rocky Liao <rjliao@codeaurora.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Rocky Liao <rjliao@codeaurora.org>
Tested-by: Rocky Liao <rjliao@codeaurora.org>
Reviewed-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Matthias Kaehlcke 2019-04-23 11:16:52 -07:00 committed by Marcel Holtmann
parent 5bec1fb866
commit ecf2b768bd
1 changed files with 2 additions and 1 deletions
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3
drivers/bluetooth/hci_qca.c
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@ -1006,7 +1006,8 @@ 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,
msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
/* Give the controller time to process the request */