i2c: Use a separate mutex for userspace client lists

Moving userspace-instantiated clients to separate lists wasn't nearly
enough to avoid deadlocks in multiplexed bus cases. We also want to
have a dedicated mutex to protect each list.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Michael Lawnick <ml.lawnick@gmx.de>

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index ba86af6..97f96b6 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -662,9 +662,9 @@ i2c_sysfs_new_device(struct device *dev, struct device_attribute *attr,
                return -EINVAL;
 
        /* Keep track of the added device */
-       i2c_lock_adapter(adap);
+       mutex_lock(&adap->userspace_clients_lock);
        list_add_tail(&client->detected, &adap->userspace_clients);
-       i2c_unlock_adapter(adap);
+       mutex_unlock(&adap->userspace_clients_lock);
        dev_info(dev, "%s: Instantiated device %s at 0x%02hx\n", "new_device",
                 info.type, info.addr);
 
@@ -703,7 +703,7 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr,
 
        /* Make sure the device was added through sysfs */
        res = -ENOENT;
-       i2c_lock_adapter(adap);
+       mutex_lock(&adap->userspace_clients_lock);
        list_for_each_entry_safe(client, next, &adap->userspace_clients,
                                 detected) {
                if (client->addr == addr) {
@@ -716,7 +716,7 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr,
                        break;
                }
        }
-       i2c_unlock_adapter(adap);
+       mutex_unlock(&adap->userspace_clients_lock);
 
        if (res < 0)
                dev_err(dev, "%s: Can't find device in list\n",
@@ -798,6 +798,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
        }
 
        rt_mutex_init(&adap->bus_lock);
+       mutex_init(&adap->userspace_clients_lock);
        INIT_LIST_HEAD(&adap->userspace_clients);
 
        /* Set default timeout to 1 second if not already set */
@@ -1003,7 +1004,7 @@ int i2c_del_adapter(struct i2c_adapter *adap)
                return res;
 
        /* Remove devices instantiated from sysfs */
-       i2c_lock_adapter(adap);
+       mutex_lock(&adap->userspace_clients_lock);
        list_for_each_entry_safe(client, next, &adap->userspace_clients,
                                 detected) {
                dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name,
@@ -1011,7 +1012,7 @@ int i2c_del_adapter(struct i2c_adapter *adap)
                list_del(&client->detected);
                i2c_unregister_device(client);
        }
-       i2c_unlock_adapter(adap);
+       mutex_unlock(&adap->userspace_clients_lock);
 
        /* Detach any active clients. This can't fail, thus we do not
           checking the returned value. */

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 5bf0f4b..798bad8 100644 (file)
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -368,6 +368,7 @@ struct i2c_adapter {
        char name[48];
        struct completion dev_released;
 
+       struct mutex userspace_clients_lock;
        struct list_head userspace_clients;
 };
 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)