lkml.org 
[lkml]   [2020]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] [v2] i2c: stm32f7: Fix runtime PM imbalance on error
Date
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
\
 
 \ /
  Last update: 2020-05-27 03:40    [W:0.036 / U:6.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site