---

yaml --- r: 281420 b: refs/heads/master c: bb01443 h: refs/heads/master v: v3
git-mirror · Dec 22, 2011 · 7602982 · 7602982
1 parent 9d1290f
commit 7602982
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Showing 3 changed files with 18 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e38c79e0825b673d97cecfb36bae9e859e724f1b
+refs/heads/master: bb01443e2cdad4ff5b98e00252e93110d00f4392
diff --git a/trunk/drivers/staging/iio/iio.h b/trunk/drivers/staging/iio/iio.h
@@ -313,6 +313,7 @@ struct iio_buffer_setup_ops {
  * @chrdev:		[INTERN] associated character device
  * @groups:		[INTERN] attribute groups
  * @groupcounter:	[INTERN] index of next attribute group
+ * @flags:		[INTERN] file ops related flags including busy flag.
  **/
 struct iio_dev {
 	int				id;
@@ -344,6 +345,8 @@ struct iio_dev {
 #define IIO_MAX_GROUPS 6
 	const struct attribute_group	*groups[IIO_MAX_GROUPS + 1];
 	int				groupcounter;
+
+	unsigned long			flags;
 };
 
 /**

diff --git a/trunk/drivers/staging/iio/industrialio-core.c b/trunk/drivers/staging/iio/industrialio-core.c
@@ -1083,18 +1083,29 @@ static int iio_chrdev_open(struct inode *inode, struct file *filp)
 {
 	struct iio_dev *indio_dev = container_of(inode->i_cdev,
 						struct iio_dev, chrdev);
+	unsigned int ret;
+
+	if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
+		return -EBUSY;
+
 	filp->private_data = indio_dev;
 
-	return iio_chrdev_buffer_open(indio_dev);
+	ret = iio_chrdev_buffer_open(indio_dev);
+	if (ret < 0)
+		clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
+
+	return ret;
 }
 
 /**
  * iio_chrdev_release() - chrdev file close buffer access and ioctls
  **/
 static int iio_chrdev_release(struct inode *inode, struct file *filp)
 {
-	iio_chrdev_buffer_release(container_of(inode->i_cdev,
-					     struct iio_dev, chrdev));
+	struct iio_dev *indio_dev = container_of(inode->i_cdev,
+						struct iio_dev, chrdev);
+	iio_chrdev_buffer_release(indio_dev);
+	clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
 	return 0;
 }