diff options
Diffstat (limited to 'drivers/staging/iio/industrialio-core.c')
| -rw-r--r-- | drivers/staging/iio/industrialio-core.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c index 326e967d54e..aec9311b108 100644 --- a/drivers/staging/iio/industrialio-core.c +++ b/drivers/staging/iio/industrialio-core.c @@ -242,19 +242,26 @@ static const struct file_operations iio_event_chrdev_fileops = { static int iio_event_getfd(struct iio_dev *indio_dev) { - if (indio_dev->event_interface == NULL) + struct iio_event_interface *ev_int = indio_dev->event_interface; + int fd; + + if (ev_int == NULL) return -ENODEV; - mutex_lock(&indio_dev->event_interface->event_list_lock); - if (test_and_set_bit(IIO_BUSY_BIT_POS, - &indio_dev->event_interface->flags)) { - mutex_unlock(&indio_dev->event_interface->event_list_lock); + mutex_lock(&ev_int->event_list_lock); + if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { + mutex_unlock(&ev_int->event_list_lock); return -EBUSY; } - mutex_unlock(&indio_dev->event_interface->event_list_lock); - return anon_inode_getfd("iio:event", - &iio_event_chrdev_fileops, - indio_dev->event_interface, O_RDONLY); + mutex_unlock(&ev_int->event_list_lock); + fd = anon_inode_getfd("iio:event", + &iio_event_chrdev_fileops, ev_int, O_RDONLY); + if (fd < 0) { + mutex_lock(&ev_int->event_list_lock); + clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); + mutex_unlock(&ev_int->event_list_lock); + } + return fd; } static int __init iio_init(void) |