block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers

In-kernel disk event polling doesn't matter for legacy/fringe drivers
and may lead to infinite event loop if ->check_events() implementation
generates events on level condition instead of edge.

Now that block layer supports suppressing exporting unlisted events,
simply leaving disk->events cleared allows these drivers to keep the
internal revalidation behavior intact while avoiding weird
interactions with userland event handler.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 68b9430c7cfe..0e376d46bdd1 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -2334,7 +2334,6 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
         disk->major = UB_MAJOR;
         disk->first_minor = lun->id * UB_PARTS_PER_LUN;
         disk->fops = &ub_bd_fops;
-        disk->events = DISK_EVENT_MEDIA_CHANGE;
         disk->private_data = lun;
         disk->driverfs_dev = &sc->intf->dev;