diff options
| author | Tony Lindgren <tony@atomide.com> | 2012-09-24 11:42:13 -0700 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2012-09-24 11:42:13 -0700 |
| commit | 3fe05bd9980df7207a35b4841a94dc2875e86960 (patch) | |
| tree | b5bb9287088955d2b4b4552b4a4ca9c4c40769a4 /drivers/i2c/i2c-core.c | |
| parent | 6bfc82ff589a00e5fbc12b958c649d703d273c86 (diff) | |
| parent | 5698bd757d55b1bb87edd1a9744ab09c142abfc2 (diff) | |
Merge tag 'v3.6-rc6' into devel-dt
Linux 3.6-rc6
Diffstat (limited to 'drivers/i2c/i2c-core.c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 2efa56c5ff2..2091ae8f539 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -637,6 +637,22 @@ static void i2c_adapter_dev_release(struct device *dev) } /* + * This function is only needed for mutex_lock_nested, so it is never + * called unless locking correctness checking is enabled. Thus we + * make it inline to avoid a compiler warning. That's what gcc ends up + * doing anyway. + */ +static inline unsigned int i2c_adapter_depth(struct i2c_adapter *adapter) +{ + unsigned int depth = 0; + + while ((adapter = i2c_parent_is_i2c_adapter(adapter))) + depth++; + + return depth; +} + +/* * Let users instantiate I2C devices through sysfs. This can be used when * platform initialization code doesn't contain the proper data for * whatever reason. Also useful for drivers that do device detection and @@ -726,7 +742,8 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr, /* Make sure the device was added through sysfs */ res = -ENOENT; - mutex_lock(&adap->userspace_clients_lock); + mutex_lock_nested(&adap->userspace_clients_lock, + i2c_adapter_depth(adap)); list_for_each_entry_safe(client, next, &adap->userspace_clients, detected) { if (client->addr == addr) { @@ -1073,7 +1090,8 @@ int i2c_del_adapter(struct i2c_adapter *adap) return res; /* Remove devices instantiated from sysfs */ - mutex_lock(&adap->userspace_clients_lock); + mutex_lock_nested(&adap->userspace_clients_lock, + i2c_adapter_depth(adap)); list_for_each_entry_safe(client, next, &adap->userspace_clients, detected) { dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name, |