i2c: cdev lock_kernel() pushdown

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 16 insertions, 6 deletions

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index d34c14c81c29..006a5857256a 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -34,6 +34,7 @@
 #include <linux/list.h>
 #include <linux/i2c.h>
 #include <linux/i2c-dev.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 static struct i2c_driver i2cdev_driver;
@@ -441,14 +442,20 @@ static int i2cdev_open(struct inode *inode, struct file *file)
         struct i2c_client *client;
         struct i2c_adapter *adap;
         struct i2c_dev *i2c_dev;
+        int ret = 0;
 
+        lock_kernel();
         i2c_dev = i2c_dev_get_by_minor(minor);
-        if (!i2c_dev)
-                return -ENODEV;
+        if (!i2c_dev) {
+                ret = -ENODEV;
+                goto out;
+        }
 
         adap = i2c_get_adapter(i2c_dev->adap->nr);
-        if (!adap)
-                return -ENODEV;
+        if (!adap) {
+                ret = -ENODEV;
+                goto out;
+        }
 
         /* This creates an anonymous i2c_client, which may later be
          * pointed to some address using I2C_SLAVE or I2C_SLAVE_FORCE.
@@ -460,7 +467,8 @@ static int i2cdev_open(struct inode *inode, struct file *file)
         client = kzalloc(sizeof(*client), GFP_KERNEL);
         if (!client) {
                 i2c_put_adapter(adap);
-                return -ENOMEM;
+                ret = -ENOMEM;
+                goto out;
         }
         snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr);
         client->driver = &i2cdev_driver;
@@ -468,7 +476,9 @@ static int i2cdev_open(struct inode *inode, struct file *file)
         client->adapter = adap;
         file->private_data = client;
 
-        return 0;
+out:
+        unlock_kernel();
+        return ret;
 }
 
 static int i2cdev_release(struct inode *inode, struct file *file)