cdrom: support devices that have check_events but not media_changed

Commit 93aae17af1172c40c6f74b7294e93a90c3cfaa5d ("sr: implement
sr_check_events()") replaced the media_changed op with the
check_events op in drivers/scsi/sr.c

All users that check for the CDC_MEDIA_CHANGED capbility try both
the check_events op and the media_changed op, but register_cdrom()
was requiring media_changed.

This patch fixes the capability checking.

The cdrom_select_disc ioctl is also using the two operations, so
they should be required for CDC_SELECT_DISC too.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Cc: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Tested-by: Chris Clayton <chris2553@googlemail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 14033a36bcd031d4825574819ac64fba71b61ec9..e2c48a7eccffe72aafe1812fb38cde294875a1a3 100644 (file)
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -409,7 +409,8 @@ int register_cdrom(struct cdrom_device_info *cdi)
        }
 
        ENSURE(drive_status, CDC_DRIVE_STATUS );
-       ENSURE(media_changed, CDC_MEDIA_CHANGED);
+       if (cdo->check_events == NULL && cdo->media_changed == NULL)
+               *change_capability = ~(CDC_MEDIA_CHANGED | CDC_SELECT_DISC);
        ENSURE(tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
        ENSURE(lock_door, CDC_LOCK);
        ENSURE(select_speed, CDC_SELECT_SPEED);