iio: fix a leak due to improper use of anon_inode_getfd()

it can fail and in that case ->release() will *not* be called...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index 326e967..2656409 100644 (file)
--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -242,6 +242,8 @@ static const struct file_operations iio_event_chrdev_fileops = {
 
 static int iio_event_getfd(struct iio_dev *indio_dev)
 {
+       int fd;
+
        if (indio_dev->event_interface == NULL)
                return -ENODEV;
 
@@ -252,9 +254,15 @@ static int iio_event_getfd(struct iio_dev *indio_dev)
                return -EBUSY;
        }
        mutex_unlock(&indio_dev->event_interface->event_list_lock);
-       return anon_inode_getfd("iio:event",
+       fd = anon_inode_getfd("iio:event",
                                &iio_event_chrdev_fileops,
                                indio_dev->event_interface, O_RDONLY);
+       if (fd < 0) {
+               mutex_lock(&indio_dev->event_interface->event_list_lock);
+               clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
+               mutex_unlock(&indio_dev->event_interface->event_list_lock);
+       }
+       return fd;
 }
 
 static int __init iio_init(void)