diff mbox series

[2/7] phy: qcom-qmp-combo: Move phy_mutex out of com_init/exit

Message ID 20230425034010.3789376-3-quic_bjorande@quicinc.com
State New
Headers
Series phy: qcom-qmp-combo: Support orientation switching |

Commit Message

Bjorn Andersson April 25, 2023, 3:40 a.m. UTC 
  With the upcoming introduction of USB Type-C orientation switching the
region of mutual exclusion needs to be extended to cover both the common
init/exit as well as the individual functions.

So move the phy_mutex one step up the stack.

Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
---
 drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 51 +++++++++++++----------
 1 file changed, 30 insertions(+), 21 deletions(-)

Comments

Johan Hovold May 2, 2023, 10:43 a.m. UTC | #1 
On Mon, Apr 24, 2023 at 08:40:05PM -0700, Bjorn Andersson wrote:
> With the upcoming introduction of USB Type-C orientation switching the
> region of mutual exclusion needs to be extended to cover both the common
> init/exit as well as the individual functions.
> 
> So move the phy_mutex one step up the stack.
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 51 +++++++++++++----------
>  1 file changed, 30 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index 6850e04c329b..7280f7141961 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -2463,16 +2463,13 @@ static int qmp_combo_com_init(struct qmp_combo *qmp)
>  	void __iomem *com = qmp->com;
>  	int ret;
>  
> -	mutex_lock(&qmp->phy_mutex);
> -	if (qmp->init_count++) {
> -		mutex_unlock(&qmp->phy_mutex);
> +	if (qmp->init_count++)
>  		return 0;
> -	}
>  
>  	ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
>  	if (ret) {
>  		dev_err(qmp->dev, "failed to enable regulators, err=%d\n", ret);
> -		goto err_unlock;
> +		goto err;

I was going to say that you can just return ret directly but then
realised we have a counter imbalance here that should be fixed.

I've just sent a couple of fixes which you could rebase on:

	https://lore.kernel.org/r/20230502103810.12061-1-johan+linaro@kernel.org

>  	}
>  
>  	ret = reset_control_bulk_assert(cfg->num_resets, qmp->resets);
> @@ -2514,16 +2511,13 @@ static int qmp_combo_com_init(struct qmp_combo *qmp)
>  	qphy_setbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
>  			SW_PWRDN);
>  
> -	mutex_unlock(&qmp->phy_mutex);
> -
>  	return 0;
>  
>  err_assert_reset:
>  	reset_control_bulk_assert(cfg->num_resets, qmp->resets);
>  err_disable_regulators:
>  	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
> -err_unlock:
> -	mutex_unlock(&qmp->phy_mutex);
> +err:
>  
>  	return ret;
>  }
 
> @@ -2686,14 +2683,19 @@ static int qmp_combo_usb_init(struct phy *phy)
>  	struct qmp_combo *qmp = phy_get_drvdata(phy);
>  	int ret;
>  
> +	mutex_lock(&qmp->phy_mutex);

Nit: I think adding a newline here would improve readability.

>  	ret = qmp_combo_com_init(qmp);
>  	if (ret)
> -		return ret;
> +		goto out_unlock;
>  
>  	ret = qmp_combo_usb_power_on(phy);
> -	if (ret)
> +	if (ret) {
>  		qmp_combo_com_exit(qmp);
> +		goto out_unlock;
> +	}
>  
> +out_unlock:
> +	mutex_unlock(&qmp->phy_mutex);

Same here.

>  	return ret;
>  }
>  
> @@ -2702,11 +2704,18 @@ static int qmp_combo_usb_exit(struct phy *phy)
>  	struct qmp_combo *qmp = phy_get_drvdata(phy);
>  	int ret;
>  
> +	mutex_lock(&qmp->phy_mutex);

And here.

>  	ret = qmp_combo_usb_power_off(phy);
>  	if (ret)
> -		return ret;
> +		goto out_unlock;
>  
> -	return qmp_combo_com_exit(qmp);
> +	ret = qmp_combo_com_exit(qmp);
> +	if (ret)
> +		goto out_unlock;
> +
> +out_unlock:
> +	mutex_unlock(&qmp->phy_mutex);

And here.

> +	return ret;
>  }
>  
>  static int qmp_combo_usb_set_mode(struct phy *phy, enum phy_mode mode, int submode)

Looks good otherwise: 

Reviewed-by: Johan Hovold <johan+linaro@kernel.org>

Johan
diff mbox series

Patch

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
index 6850e04c329b..7280f7141961 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
@@ -2463,16 +2463,13 @@  static int qmp_combo_com_init(struct qmp_combo *qmp)
 	void __iomem *com = qmp->com;
 	int ret;
 
-	mutex_lock(&qmp->phy_mutex);
-	if (qmp->init_count++) {
-		mutex_unlock(&qmp->phy_mutex);
+	if (qmp->init_count++)
 		return 0;
-	}
 
 	ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
 	if (ret) {
 		dev_err(qmp->dev, "failed to enable regulators, err=%d\n", ret);
-		goto err_unlock;
+		goto err;
 	}
 
 	ret = reset_control_bulk_assert(cfg->num_resets, qmp->resets);
@@ -2514,16 +2511,13 @@  static int qmp_combo_com_init(struct qmp_combo *qmp)
 	qphy_setbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
 			SW_PWRDN);
 
-	mutex_unlock(&qmp->phy_mutex);
-
 	return 0;
 
 err_assert_reset:
 	reset_control_bulk_assert(cfg->num_resets, qmp->resets);
 err_disable_regulators:
 	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
-err_unlock:
-	mutex_unlock(&qmp->phy_mutex);
+err:
 
 	return ret;
 }
@@ -2532,11 +2526,8 @@  static int qmp_combo_com_exit(struct qmp_combo *qmp)
 {
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
 
-	mutex_lock(&qmp->phy_mutex);
-	if (--qmp->init_count) {
-		mutex_unlock(&qmp->phy_mutex);
+	if (--qmp->init_count)
 		return 0;
-	}
 
 	reset_control_bulk_assert(cfg->num_resets, qmp->resets);
 
@@ -2544,8 +2535,6 @@  static int qmp_combo_com_exit(struct qmp_combo *qmp)
 
 	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
 
-	mutex_unlock(&qmp->phy_mutex);
-
 	return 0;
 }
 
@@ -2555,21 +2544,29 @@  static int qmp_combo_dp_init(struct phy *phy)
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
 	int ret;
 
+	mutex_lock(&qmp->phy_mutex);
+
 	ret = qmp_combo_com_init(qmp);
 	if (ret)
-		return ret;
+		goto out_unlock;
 
 	cfg->dp_aux_init(qmp);
 
-	return 0;
+out_unlock:
+	mutex_unlock(&qmp->phy_mutex);
+	return ret;
 }
 
 static int qmp_combo_dp_exit(struct phy *phy)
 {
 	struct qmp_combo *qmp = phy_get_drvdata(phy);
 
+	mutex_lock(&qmp->phy_mutex);
+
 	qmp_combo_com_exit(qmp);
 
+	mutex_unlock(&qmp->phy_mutex);
+
 	return 0;
 }
 
@@ -2686,14 +2683,19 @@  static int qmp_combo_usb_init(struct phy *phy)
 	struct qmp_combo *qmp = phy_get_drvdata(phy);
 	int ret;
 
+	mutex_lock(&qmp->phy_mutex);
 	ret = qmp_combo_com_init(qmp);
 	if (ret)
-		return ret;
+		goto out_unlock;
 
 	ret = qmp_combo_usb_power_on(phy);
-	if (ret)
+	if (ret) {
 		qmp_combo_com_exit(qmp);
+		goto out_unlock;
+	}
 
+out_unlock:
+	mutex_unlock(&qmp->phy_mutex);
 	return ret;
 }
 
@@ -2702,11 +2704,18 @@  static int qmp_combo_usb_exit(struct phy *phy)
 	struct qmp_combo *qmp = phy_get_drvdata(phy);
 	int ret;
 
+	mutex_lock(&qmp->phy_mutex);
 	ret = qmp_combo_usb_power_off(phy);
 	if (ret)
-		return ret;
+		goto out_unlock;
 
-	return qmp_combo_com_exit(qmp);
+	ret = qmp_combo_com_exit(qmp);
+	if (ret)
+		goto out_unlock;
+
+out_unlock:
+	mutex_unlock(&qmp->phy_mutex);
+	return ret;
 }
 
 static int qmp_combo_usb_set_mode(struct phy *phy, enum phy_mode mode, int submode)