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authorMika Kuoppala <mika.kuoppala@nokia.com>2009-12-06 17:06:22 +0100
committerJean Delvare <khali@linux-fr.org>2009-12-06 17:06:22 +0100
commit194684e596af4bdaebb424166d94a8aa528edfda (patch)
tree1a6b0ede432e8c9fb4f7a1652deb71044ff9aa50
parenta0c11cdd6a1975fd8d6d186f2e2865a82f3e9bbf (diff)
i2c: Prevent priority inversion on top of bus lock
Low priority thread holding the i2c bus mutex could block higher priority threads to access the bus resulting in unacceptable latencies. Change the mutex type to rt_mutex preventing priority inversion. Tested-by: Peter Ujfalusi <peter.ujfalusi@nokia.com> Signed-off-by: Mika Kuoppala <mika.kuoppala@nokia.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
-rw-r--r--drivers/i2c/Kconfig1
-rw-r--r--drivers/i2c/i2c-core.c12
-rw-r--r--include/linux/i2c.h7
3 files changed, 10 insertions, 10 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index d7ece131b4f4..8d8a00e5a30e 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -5,6 +5,7 @@
menuconfig I2C
tristate "I2C support"
depends on HAS_IOMEM
+ select RT_MUTEXES
---help---
I2C (pronounce: I-square-C) is a slow serial bus protocol used in
many micro controller applications and developed by Philips. SMBus,
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 296504355142..d664b4a97a31 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -584,7 +584,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
goto out_list;
}
- mutex_init(&adap->bus_lock);
+ rt_mutex_init(&adap->bus_lock);
/* Set default timeout to 1 second if not already set */
if (adap->timeout == 0)
@@ -1092,12 +1092,12 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
#endif
if (in_atomic() || irqs_disabled()) {
- ret = mutex_trylock(&adap->bus_lock);
+ ret = rt_mutex_trylock(&adap->bus_lock);
if (!ret)
/* I2C activity is ongoing. */
return -EAGAIN;
} else {
- mutex_lock_nested(&adap->bus_lock, adap->level);
+ rt_mutex_lock(&adap->bus_lock);
}
/* Retry automatically on arbitration loss */
@@ -1109,7 +1109,7 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
if (time_after(jiffies, orig_jiffies + adap->timeout))
break;
}
- mutex_unlock(&adap->bus_lock);
+ rt_mutex_unlock(&adap->bus_lock);
return ret;
} else {
@@ -1913,7 +1913,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
flags &= I2C_M_TEN | I2C_CLIENT_PEC;
if (adapter->algo->smbus_xfer) {
- mutex_lock(&adapter->bus_lock);
+ rt_mutex_lock(&adapter->bus_lock);
/* Retry automatically on arbitration loss */
orig_jiffies = jiffies;
@@ -1927,7 +1927,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
orig_jiffies + adapter->timeout))
break;
}
- mutex_unlock(&adapter->bus_lock);
+ rt_mutex_unlock(&adapter->bus_lock);
} else
res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write,
command, protocol, data);
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 7b40cda57a70..52317fb5917e 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -338,8 +338,7 @@ struct i2c_adapter {
void *algo_data;
/* data fields that are valid for all devices */
- u8 level; /* nesting level for lockdep */
- struct mutex bus_lock;
+ struct rt_mutex bus_lock;
int timeout; /* in jiffies */
int retries;
@@ -367,7 +366,7 @@ static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data)
*/
static inline void i2c_lock_adapter(struct i2c_adapter *adapter)
{
- mutex_lock(&adapter->bus_lock);
+ rt_mutex_lock(&adapter->bus_lock);
}
/**
@@ -376,7 +375,7 @@ static inline void i2c_lock_adapter(struct i2c_adapter *adapter)
*/
static inline void i2c_unlock_adapter(struct i2c_adapter *adapter)
{
- mutex_unlock(&adapter->bus_lock);
+ rt_mutex_unlock(&adapter->bus_lock);
}
/*flags for the client struct: */