[SCSI] sg: no need sg_open_exclusive_lock
[SCSI] sg: no need sg_open_exclusive_lock

Open exclusive check is protected by o_sem, no need sg_open_exclusive_lock.
@exclude is used to record which type of rwsem we are holding.

Signed-off-by: Vaughan Cao <4153aaee9564c8d7cd638e908a6e859a1825f40e@oracle.com>
Acked-by: Douglas Gilbert <54dff2264884c355ed5584a3b7f1530b4b26921e@interlog.com>
Signed-off-by: James Bottomley <1acebbdca565c7b6b638bdc23b58b5610d1a56b8@Parallels.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs