linux-kernel - Re: [PATCH v10 3/7] Bluetooth: btqca: Redefine qca_uart

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Date:   Mon, 23 Jul 2018 10:40:18 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, thierry.escande@...aro.org,
        rtatiya@...eaurora.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v10 3/7] Bluetooth: btqca: Redefine qca_uart_setup() to
 generic function.

On Fri, Jul 20, 2018 at 07:02:39PM +0530, Balakrishna Godavarthi wrote:
> Redefinition of qca_uart_setup will help future Qualcomm Bluetooth
> SoC, to use the same function instead of duplicating the function.
> Added new arguments soc_type and soc_ver to the functions.
> 
> These arguments will help to decide type of firmware files
> to be loaded into Bluetooth chip.
> soc_type holds the Bluetooth chip connected to APPS processor.
> soc_ver holds the Bluetooth chip version.
> 
> Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>  drivers/bluetooth/btqca.c   | 20 +++++++-------------
>  drivers/bluetooth/btqca.h   | 13 +++++++++++--
>  drivers/bluetooth/hci_qca.c | 10 +++++++++-
>  3 files changed, 27 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
> index c5cf9cab438a..b556710ee1bd 100644
> --- a/drivers/bluetooth/btqca.c
> +++ b/drivers/bluetooth/btqca.c
> @@ -85,6 +85,9 @@ int qca_read_soc_version(struct hci_dev *hdev, u32 *soc_version)
>  out:
>  	kfree_skb(skb);
>  
> +	if (err < 0 || *soc_version == 0)
> +		bt_dev_err(hdev, "QCA Failed to get version (%d)", err);

You also have to set 'err' if soc_version is 0, so the caller can skip
the check for soc_version == 0

I'd suggest:

  // directly after setting soc_version
  if (*soc_version == 0)
    err = -EILSEQ; // or should it be a different error code?

  ...

  if (err)
    bt_dev_err(hdev, "QCA Failed to get version (%d)", err);

You could also limit the error log to the 'if (*soc_version == 0)'
branch, for all other errors there will already be a more specific log
entry.

> +
>  	return err;
>  }

Cheers

Matthias