staging:iio: Drop buffer busy flag

The flag is only cleared, never set or tested, so it is safe to remove it.
Acked-by: NJonathan Cameron <jic23@kernel.org>
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/buffer.h

@@ -79,7 +79,6 @@ struct iio_buffer_access_funcs {
  *			created from the iio_chan_info array.
  * @pollq:		[INTERN] wait queue to allow for polling on the buffer.
  * @stufftoread:	[INTERN] flag to indicate new data.
- * @flags:		[INTERN] file ops related flags including busy flag.
  * @demux_list:		[INTERN] list of operations required to demux the scan.
  * @demux_bounce:	[INTERN] buffer for doing gather from incoming scan.
  **/
@@ -95,7 +94,6 @@ struct iio_buffer {
 	struct attribute_group			scan_el_group;
 	wait_queue_head_t			pollq;
 	bool					stufftoread;
-	unsigned long				flags;
 	const struct attribute_group *attrs;
 	struct list_head			demux_list;
 	unsigned char				*demux_bounce;

drivers/staging/iio/industrialio-buffer.c

@@ -80,7 +80,6 @@ void iio_chrdev_buffer_release(struct iio_dev *indio_dev)
 
 	if (!rb)
 		return;
-	clear_bit(IIO_BUSY_BIT_POS, &rb->flags);
 	if (rb->access->unmark_in_use)
 		rb->access->unmark_in_use(rb);
 }