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[SCSI] st: Increase success probability in driver buffer allocation

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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: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Kai Makisara <kai.makisara@kolumbus.fi>
Reported-by: Lukas Kolbe <lkolbe@techfak.uni-bielefeld.de>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
FUJITA Tomonori 2010-12-20 18:44:45 +02:00 committed by James Bottomley
parent 373daacfce
commit 46081b1664
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/st.c
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@ -3729,7 +3729,8 @@ static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dm
b_size = PAGE_SIZE << order;
} else {
for (b_size = PAGE_SIZE, order = 0;
order < ST_MAX_ORDER && b_size < new_size;
order < ST_MAX_ORDER &&
max_segs * (PAGE_SIZE << order) < new_size;
order++, b_size *= 2)
; /* empty */
STbuffer->reserved_page_order = order;