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Subject[PATCH -mm 09/11] call blk_queue_segment_boundary in __scsi_alloc_queue
request_queue and device struct must have the same value of a segment
size limit. This patch adds blk_queue_segment_boundary in
__scsi_alloc_queue so LLDs don't need to call both
blk_queue_segment_boundary and set_dma_max_seg_size. A LLD can change
the default value (64KB) can call device_dma_parameters accessors like
pci_set_dma_max_seg_size when allocating scsi_host.

Signed-off-by: FUJITA Tomonori <>
drivers/scsi/scsi_lib.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 61fdaf0..23a30ab 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1645,6 +1645,7 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
request_fn_proc *request_fn)
struct request_queue *q;
+ struct device *dev = shost->shost_gendev.parent;

q = blk_init_queue(request_fn, NULL);
if (!q)
@@ -1673,6 +1674,8 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
blk_queue_segment_boundary(q, shost->dma_boundary);

+ blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));
if (!shost->use_clustering)
clear_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
return q;
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