UIO: cdev lock_kernel() pushdown

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

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 55cc7b80422a..1a0415e77a30 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -297,12 +297,17 @@ static int uio_open(struct inode *inode, struct file *filep)
         struct uio_listener *listener;
         int ret = 0;
 
+        lock_kernel();
         idev = idr_find(&uio_idr, iminor(inode));
-        if (!idev)
-                return -ENODEV;
+        if (!idev) {
+                ret = -ENODEV;
+                goto out;
+        }
 
-        if (!try_module_get(idev->owner))
-                return -ENODEV;
+        if (!try_module_get(idev->owner)) {
+                ret = -ENODEV;
+                goto out;
+        }
 
         listener = kmalloc(sizeof(*listener), GFP_KERNEL);
         if (!listener) {
@@ -319,7 +324,7 @@ static int uio_open(struct inode *inode, struct file *filep)
                 if (ret)
                         goto err_infoopen;
         }
-
+        unlock_kernel();
         return 0;
 
 err_infoopen:
@@ -329,6 +334,8 @@ err_alloc_listener:
 
         module_put(idev->owner);
 
+out:
+        unlock_kernel();
         return ret;
 }