| Message ID | 20200527013853.30252-1-dinghao.liu@zju.edu.cn |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] i2c: stm32f7: Fix runtime PM imbalance on error | expand |
Hello Looks good to me Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com> Thx Regards On 6/1/20 7:56 AM, Alain Volmat wrote: > Hi, > > Reviewed-by: Alain Volmat <alain.volmat@st.com> > > Thanks, > Alain > > On Wed, May 27, 2020 at 01:38:53AM +0000, Dinghao Liu wrote: >> 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 >>
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)
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(-)