linux-kernel - Re: [PATCH v2] Bluetooth: hci_qca: Add helper function to get the chip family

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Message-Id: <A2E5F727-578B-42D6-94AC-152A510532A7@holtmann.org>
Date:   Mon, 11 Mar 2019 19:54:48 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Hemantg <hemantg@...eaurora.org>
Subject: Re: [PATCH v2] Bluetooth: hci_qca: Add helper function to get the
 chip family

Hi Matthias,

> Many functions obtain a 'struct qca_serdev' only to read the btsoc_type
> field. Add a helper function that encapsulates this.
> 
> This also fixes crashes observed on platforms with ROME controllers
> that are instantiated through ldisc and not as serdev clients. The
> crashes are caused by NULL pointer dereferentiations, which stem from
> the driver's assumption that a QCA HCI device is always associated with
> a serdev device.
> 
> Fixes: fa9ad876b8e0 ("Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990")
> Reported-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - make ROME the default type for non-serdev platforms
> ---
> drivers/bluetooth/hci_qca.c | 45 +++++++++++++++++++++----------------
> 1 file changed, 26 insertions(+), 19 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel