linux-kernel - [PATCH v3 6/6] phy: rockchip-pcie: Use guard notation when acquiring mutex

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Message-ID: <20241012071919.3726-7-linux.amoon@gmail.com>
Date: Sat, 12 Oct 2024 12:49:08 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-phy@...ts.infradead.org (open list:GENERIC PHY FRAMEWORK),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Rockchip SoC support),
	linux-rockchip@...ts.infradead.org (open list:ARM/Rockchip SoC support),
	linux-kernel@...r.kernel.org (open list)
Cc: Anand Moon <linux.amoon@...il.com>,
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH v3 6/6] phy: rockchip-pcie: Use guard notation when acquiring mutex

Using guard notation makes the code more compact and error handling
more robust by ensuring that mutexes are released in all code paths
when control leaves critical section.

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
v3: New patch
---
 drivers/phy/rockchip/phy-rockchip-pcie.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-pcie.c b/drivers/phy/rockchip/phy-rockchip-pcie.c
index 6dd014625226..bd44af36c67a 100644
--- a/drivers/phy/rockchip/phy-rockchip-pcie.c
+++ b/drivers/phy/rockchip/phy-rockchip-pcie.c
@@ -124,7 +124,7 @@ static int rockchip_pcie_phy_power_off(struct phy *phy)
 	struct rockchip_pcie_phy *rk_phy = to_pcie_phy(inst);
 	int err = 0;
 
-	mutex_lock(&rk_phy->pcie_mutex);
+	guard(mutex)(&rk_phy->pcie_mutex);
 
 	regmap_write(rk_phy->reg_base,
 		     rk_phy->phy_data->pcie_laneoff,
@@ -133,7 +133,6 @@ static int rockchip_pcie_phy_power_off(struct phy *phy)
 				   PHY_LANE_IDLE_A_SHIFT + inst->index));
 
 	if (--rk_phy->pwr_cnt) {
-		mutex_unlock(&rk_phy->pcie_mutex);
 		return 0;
 	}
 
@@ -146,11 +145,9 @@ static int rockchip_pcie_phy_power_off(struct phy *phy)
 			     HIWORD_UPDATE(!PHY_LANE_IDLE_OFF,
 					   PHY_LANE_IDLE_MASK,
 					   PHY_LANE_IDLE_A_SHIFT + inst->index));
-		mutex_unlock(&rk_phy->pcie_mutex);
 		return err;
 	}
 
-	mutex_unlock(&rk_phy->pcie_mutex);
 	return err;
 }
 
@@ -161,10 +158,9 @@ static int rockchip_pcie_phy_power_on(struct phy *phy)
 	int err = 0;
 	u32 status;
 
-	mutex_lock(&rk_phy->pcie_mutex);
+	guard(mutex)(&rk_phy->pcie_mutex);
 
 	if (rk_phy->pwr_cnt++) {
-		mutex_unlock(&rk_phy->pcie_mutex);
 		return 0;
 	}
 
@@ -172,7 +168,6 @@ static int rockchip_pcie_phy_power_on(struct phy *phy)
 	if (err) {
 		dev_err(&phy->dev, "deassert phy_rst err %d\n", err);
 		rk_phy->pwr_cnt--;
-		mutex_unlock(&rk_phy->pcie_mutex);
 		return err;
 	}
 
@@ -230,13 +225,11 @@ static int rockchip_pcie_phy_power_on(struct phy *phy)
 		goto err_pll_lock;
 	}
 
-	mutex_unlock(&rk_phy->pcie_mutex);
 	return err;
 
 err_pll_lock:
 	reset_control_assert(rk_phy->phy_rst);
 	rk_phy->pwr_cnt--;
-	mutex_unlock(&rk_phy->pcie_mutex);
 	return err;
 }
 
@@ -246,10 +239,9 @@ static int rockchip_pcie_phy_init(struct phy *phy)
 	struct rockchip_pcie_phy *rk_phy = to_pcie_phy(inst);
 	int err = 0;
 
-	mutex_lock(&rk_phy->pcie_mutex);
+	guard(mutex)(&rk_phy->pcie_mutex);
 
 	if (rk_phy->init_cnt++) {
-		mutex_unlock(&rk_phy->pcie_mutex);
 		return 0;
 	}
 
@@ -257,11 +249,9 @@ static int rockchip_pcie_phy_init(struct phy *phy)
 	if (err) {
 		dev_err(&phy->dev, "assert phy_rst err %d\n", err);
 		rk_phy->init_cnt--;
-		mutex_unlock(&rk_phy->pcie_mutex);
 		return err;
 	}
 
-	mutex_unlock(&rk_phy->pcie_mutex);
 	return err;
 }
 
@@ -270,13 +260,12 @@ static int rockchip_pcie_phy_exit(struct phy *phy)
 	struct phy_pcie_instance *inst = phy_get_drvdata(phy);
 	struct rockchip_pcie_phy *rk_phy = to_pcie_phy(inst);
 
-	mutex_lock(&rk_phy->pcie_mutex);
+	guard(mutex)(&rk_phy->pcie_mutex);
 
 	if (--rk_phy->init_cnt)
 		goto err_init_cnt;
 
 err_init_cnt:
-	mutex_unlock(&rk_phy->pcie_mutex);
 	return 0;
 }
 
-- 
2.44.0