ataflop: use bdev_check_media_change

Switch to use bdev_check_media_change instead of check_disk_change and
call floppy_revalidate manually.  Given that floppy_revalidate only
deals with media change events, the extra call into ->revalidate_disk
from bdev_disk_changed is not required either, so stop wiring up the
method.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/ataflop.c

@@ -1732,7 +1732,8 @@ static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode,
 		/* invalidate the buffer track to force a reread */
 		BufferDrive = -1;
 		set_bit(drive, &fake_change);
-		check_disk_change(bdev);
+		if (bdev_check_media_change(bdev))
+			floppy_revalidate(bdev->bd_disk);
 		return 0;
 	default:
 		return -EINVAL;
@@ -1909,7 +1910,8 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
 		return 0;
 
 	if (mode & (FMODE_READ|FMODE_WRITE)) {
-		check_disk_change(bdev);
+		if (bdev_check_media_change(bdev))
+			floppy_revalidate(bdev->bd_disk);
 		if (mode & FMODE_WRITE) {
 			if (p->wpstat) {
 				if (p->ref < 0)
@@ -1953,7 +1955,6 @@ static const struct block_device_operations floppy_fops = {
 	.release	= floppy_release,
 	.ioctl		= fd_ioctl,
 	.check_events	= floppy_check_events,
-	.revalidate_disk= floppy_revalidate,
 };
 
 static const struct blk_mq_ops ataflop_mq_ops = {