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

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Date:   Mon, 11 Mar 2019 12:05:32 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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

On Mon, Mar 11, 2019 at 11:38:31AM -0700, Matthias Kaehlcke wrote:
> 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")

TBH I'm not sure how useful the 'Fixes' tag is in this case. There are
a bunch of other fixes without the tag, intermingled with a few
improvements and new features.