Modify allocation to try the minimum possible page order allowed by the HBA
scatter/gather segment limit in allocation of the driver's internal
buffer. This increases the probability of successful allocation. The
allocation may still fail if this minimum order is > 0.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NKai Makisara <kai.makisara@kolumbus.fi>
Reported-by: NLukas Kolbe <lkolbe@techfak.uni-bielefeld.de>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>