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From: Dinghao Liu <dinghao.liu@zju.edu.cn>
To: dinghao.liu@zju.edu.cn, kjlu@umn.edu
Cc: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@st.com>,
	linux-i2c@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] [v2] i2c: stm32f7: Fix runtime PM imbalance on error
Date: Wed, 27 May 2020 09:38:53 +0800	[thread overview]
Message-ID: <20200527013853.30252-1-dinghao.liu@zju.edu.cn> (raw)

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---

Changelog:

v2: - Use pm_runtime_put_noidle() instead of
      pm_runtime_put_autosuspend(). Fix 5 more
      similar cases within this dirver.
---
 drivers/i2c/busses/i2c-stm32f7.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 330ffed011e0..822fd1f5b5ae 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1620,8 +1620,10 @@ static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
 	f7_msg->smbus = false;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	ret = stm32f7_i2c_wait_free_bus(i2c_dev);
 	if (ret)
@@ -1666,8 +1668,10 @@ static int stm32f7_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
 	f7_msg->smbus = true;
 
 	ret = pm_runtime_get_sync(dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(dev);
 		return ret;
+	}
 
 	ret = stm32f7_i2c_wait_free_bus(i2c_dev);
 	if (ret)
@@ -1767,8 +1771,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
 		return ret;
 
 	ret = pm_runtime_get_sync(dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(dev);
 		return ret;
+	}
 
 	if (!stm32f7_i2c_is_slave_registered(i2c_dev))
 		stm32f7_i2c_enable_wakeup(i2c_dev, true);
@@ -1837,8 +1843,10 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
 	WARN_ON(!i2c_dev->slave[id]);
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	if (id == 0) {
 		mask = STM32F7_I2C_OAR1_OA1EN;
@@ -2182,8 +2190,10 @@ static int stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
 	struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	backup_regs->cr1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR1);
 	backup_regs->cr2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR2);
@@ -2204,8 +2214,10 @@ static int stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
 	struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	cr1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR1);
 	if (cr1 & STM32F7_I2C_CR1_PE)
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Dinghao Liu <dinghao.liu@zju.edu.cn>
To: dinghao.liu@zju.edu.cn, kjlu@umn.edu
Cc: Alexandre Torgue <alexandre.torgue@st.com>,
	linux-kernel@vger.kernel.org,
	Pierre-Yves MORDRET <pierre-yves.mordret@st.com>,
	linux-i2c@vger.kernel.org,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] [v2] i2c: stm32f7: Fix runtime PM imbalance on error
Date: Wed, 27 May 2020 09:38:53 +0800	[thread overview]
Message-ID: <20200527013853.30252-1-dinghao.liu@zju.edu.cn> (raw)

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---

Changelog:

v2: - Use pm_runtime_put_noidle() instead of
      pm_runtime_put_autosuspend(). Fix 5 more
      similar cases within this dirver.
---
 drivers/i2c/busses/i2c-stm32f7.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 330ffed011e0..822fd1f5b5ae 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1620,8 +1620,10 @@ static int stm32f7_i2c_xfer(struct i2c_adapter *i2c_adap,
 	f7_msg->smbus = false;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	ret = stm32f7_i2c_wait_free_bus(i2c_dev);
 	if (ret)
@@ -1666,8 +1668,10 @@ static int stm32f7_i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
 	f7_msg->smbus = true;
 
 	ret = pm_runtime_get_sync(dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(dev);
 		return ret;
+	}
 
 	ret = stm32f7_i2c_wait_free_bus(i2c_dev);
 	if (ret)
@@ -1767,8 +1771,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
 		return ret;
 
 	ret = pm_runtime_get_sync(dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(dev);
 		return ret;
+	}
 
 	if (!stm32f7_i2c_is_slave_registered(i2c_dev))
 		stm32f7_i2c_enable_wakeup(i2c_dev, true);
@@ -1837,8 +1843,10 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
 	WARN_ON(!i2c_dev->slave[id]);
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	if (id == 0) {
 		mask = STM32F7_I2C_OAR1_OA1EN;
@@ -2182,8 +2190,10 @@ static int stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
 	struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	backup_regs->cr1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR1);
 	backup_regs->cr2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR2);
@@ -2204,8 +2214,10 @@ static int stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
 	struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
 
 	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(i2c_dev->dev);
 		return ret;
+	}
 
 	cr1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_CR1);
 	if (cr1 & STM32F7_I2C_CR1_PE)
-- 
2.17.1


_______________________________________________
linux-arm-kernel mailing list
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2020-05-27  1:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-27  1:38 Dinghao Liu [this message]
2020-05-27  1:38 ` [PATCH] [v2] i2c: stm32f7: Fix runtime PM imbalance on error Dinghao Liu
2020-06-01  5:56 ` Alain Volmat
2020-06-01  5:56   ` Alain Volmat
2020-11-13  8:27   ` Pierre Yves MORDRET
2020-11-13  8:27     ` Pierre Yves MORDRET

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