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>

1 files changed, 6 insertions, 6 deletions

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);