blk_recalc_rq_segments forgots to take ->max_segment_size into account and
gladly merges segments bigger than we can support, thus underestimating the
number of segments needed to fill it.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>