The ->nr_pending counted should always be decremented with rdev_dec_pending,
as this need to do things when the count hits zero.  There were a few places
where it was being decremented directly.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>