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path: root/drivers/i2c/i2c-dev.c
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Diffstat (limited to 'drivers/i2c/i2c-dev.c')
-rw-r--r--drivers/i2c/i2c-dev.c29
1 files changed, 12 insertions, 17 deletions
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index df540d5dfaf..393e679d9fa 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -182,27 +182,22 @@ static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t c
return ret;
}
+static int i2cdev_check(struct device *dev, void *addrp)
+{
+ struct i2c_client *client = i2c_verify_client(dev);
+
+ if (!client || client->addr != *(unsigned int *)addrp)
+ return 0;
+
+ return dev->driver ? -EBUSY : 0;
+}
+
/* This address checking function differs from the one in i2c-core
in that it considers an address with a registered device, but no
- bound driver, as NOT busy. */
+ driver bound to it, as NOT busy. */
static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr)
{
- struct list_head *item;
- struct i2c_client *client;
- int res = 0;
-
- mutex_lock(&adapter->clist_lock);
- list_for_each(item, &adapter->clients) {
- client = list_entry(item, struct i2c_client, list);
- if (client->addr == addr) {
- if (client->driver)
- res = -EBUSY;
- break;
- }
- }
- mutex_unlock(&adapter->clist_lock);
-
- return res;
+ return device_for_each_child(&adapter->dev, &addr, i2cdev_check);
}
static int i2cdev_ioctl(struct inode *inode, struct file *file,