commit 2bea2e4abf2fe8bc7384103aeaad91089109cfba
author Linus Torvalds <torvalds@linux-foundation.org> Mon Oct 20 13:42:14 2008 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Mon Oct 20 13:42:14 2008 -0700
tree 3f7cf9712fa8998213bf2f7ed97b40e65946cd92
parent a0bfb673dca8a2b4324fe11e678ec6d6a9ad67e0
parent 0d4a7bc12ffecd3ba41dd94179cc5b272b71ce8a

Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6

* 'bkl-removal' of git://git.lwn.net/linux-2.6:
  UIO: BKL removal

drivers/uio/uio.c

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 5dccf05..f9b4647 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -47,6 +47,9 @@
 	struct class *class;
 } *uio_class;
 
+/* Protect idr accesses */
+static DEFINE_MUTEX(minor_lock);
+
 /*
  * attributes
  */
@@ -239,7 +242,6 @@
 
 static int uio_get_minor(struct uio_device *idev)
 {
-	static DEFINE_MUTEX(minor_lock);
 	int retval = -ENOMEM;
 	int id;
 
@@ -261,7 +263,9 @@
 
 static void uio_free_minor(struct uio_device *idev)
 {
+	mutex_lock(&minor_lock);
 	idr_remove(&uio_idr, idev->minor);
+	mutex_unlock(&minor_lock);
 }
 
 /**
@@ -305,8 +309,9 @@
 	struct uio_listener *listener;
 	int ret = 0;
 
-	lock_kernel();
+	mutex_lock(&minor_lock);
 	idev = idr_find(&uio_idr, iminor(inode));
+	mutex_unlock(&minor_lock);
 	if (!idev) {
 		ret = -ENODEV;
 		goto out;
@@ -332,18 +337,15 @@
 		if (ret)
 			goto err_infoopen;
 	}
-	unlock_kernel();
 	return 0;
 
 err_infoopen:
-
 	kfree(listener);
-err_alloc_listener:
 
+err_alloc_listener:
 	module_put(idev->owner);
 
 out:
-	unlock_kernel();
 	return ret;
 }