linux-kernel - Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL returned by gpiod_get

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Date: Wed, 24 Apr 2024 20:35:03 +0800
From: quic_zijuhu <quic_zijuhu@...cinc.com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
        Marcel Holtmann
	<marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC: <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bartosz
 Golaszewski <bartosz.golaszewski@...aro.org>,
        Wren Turkal
	<wt@...guintechs.org>
Subject: Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL
 returned by gpiod_get_optional()

On 4/24/2024 8:29 PM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Any return value from gpiod_get_optional() other than a pointer to a
> GPIO descriptor or a NULL-pointer is an error and the driver should
> abort probing. That being said: commit 56d074d26c58 ("Bluetooth: hci_qca:
> don't use IS_ERR_OR_NULL() with gpiod_get_optional()") no longer sets
> power_ctrl_enabled on NULL-pointer returned by
> devm_gpiod_get_optional(). Restore this behavior but bail-out on errors.
> While at it: also bail-out on error returned when trying to get the
> "swctrl" GPIO.
> 
> Reported-by: Wren Turkal <wt@...guintechs.org>
> Reported-by: Zijun Hu <quic_zijuhu@...cinc.com>
> Closes: https://lore.kernel.org/linux-bluetooth/1713449192-25926-2-git-send-email-quic_zijuhu@quicinc.com/
> Fixes: 56d074d26c58 ("Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with gpiod_get_optional()")
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
> v1 -> v2:
> - also restore the previous behavior for QCA6390 and other models that
>   fall under the default: label in the affected switch case
> - bail-out on errors when getting the swctrl GPIO too
> 
>  drivers/bluetooth/hci_qca.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 92fa20f5ac7d..0e98ad2c0c9d 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -2327,16 +2327,21 @@ static int qca_serdev_probe(struct serdev_device *serdev)
>  		    (data->soc_type == QCA_WCN6750 ||
>  		     data->soc_type == QCA_WCN6855)) {
>  			dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
> -			power_ctrl_enabled = false;
> +			return PTR_ERR(qcadev->bt_en);
>  		}
>  
> +		if (!qcadev->bt_en)
> +			power_ctrl_enabled = false;
> +
>  		qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
>  					       GPIOD_IN);
>  		if (IS_ERR(qcadev->sw_ctrl) &&
>  		    (data->soc_type == QCA_WCN6750 ||
>  		     data->soc_type == QCA_WCN6855 ||
> -		     data->soc_type == QCA_WCN7850))
> -			dev_warn(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
> +		     data->soc_type == QCA_WCN7850)) {
> +			dev_err(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
> +			return PTR_ERR(qcadev->sw_ctrl);
> +		}
>  
>  		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
>  		if (IS_ERR(qcadev->susclk)) {
> @@ -2355,10 +2360,13 @@ static int qca_serdev_probe(struct serdev_device *serdev)
>  		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
>  					       GPIOD_OUT_LOW);
>  		if (IS_ERR(qcadev->bt_en)) {
> -			dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
> -			power_ctrl_enabled = false;
> +			dev_err(&serdev->dev, "failed to acquire enable gpio\n");
> +			return PTR_ERR(qcadev->bt_en);
>  		}
>  
> +		if (!qcadev->bt_en)
> +			power_ctrl_enabled = false;
> +
>  		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
>  		if (IS_ERR(qcadev->susclk)) {
>  			dev_warn(&serdev->dev, "failed to acquire clk\n");NAK, you don't answer my question for your v1 before send v2