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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-12-20 18:44:45 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2010-12-22 23:26:50 -0600 |
| commit | 46081b166415acb66d4b3150ecefcd9460bb48a1 (patch) | |
| tree | fd164cf95a6981fe5888108469e694806d02e6d1 /drivers/scsi/st.c | |
| parent | 373daacfce9ea0091cb3027572354ddebefb8ebb (diff) | |
| download | op-kernel-dev-46081b166415acb66d4b3150ecefcd9460bb48a1.zip op-kernel-dev-46081b166415acb66d4b3150ecefcd9460bb48a1.tar.gz | |
[SCSI] st: Increase success probability in driver buffer allocation
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>
Diffstat (limited to 'drivers/scsi/st.c')
| -rw-r--r-- | drivers/scsi/st.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 12a36aca..1871b8a 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -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; |
