2024-04-24 12:36:24

by Zijun Hu

[permalink] [raw]
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 <[email protected]>
>
> 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 <[email protected]>
> Reported-by: Zijun Hu <[email protected]>
> Closes: https://lore.kernel.org/linux-bluetooth/[email protected]/
> Fixes: 56d074d26c58 ("Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with gpiod_get_optional()")
> Reviewed-by: Krzysztof Kozlowski <[email protected]>
> Signed-off-by: Bartosz Golaszewski <[email protected]>
> ---
> 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