On 04/12/2016 07:13 AM, Christoph Hellwig wrote:
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 8106515..ad79372 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2120,7 +2120,8 @@ static void __scsi_init_queue(struct Scsi_Host *shost,
struct request_queue *q)
blk_queue_segment_boundary(q, shost->dma_boundary);
dma_set_seg_boundary(dev, shost->dma_boundary);
- blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));
+ blk_queue_max_segment_size(q, min_not_zero(shost->max_segment_size,
+ dma_get_max_seg_size(dev)));
if (!shost->use_clustering)
q->limits.cluster = 0;
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index fcfa3d7..f11d3fe 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -621,6 +621,7 @@ struct Scsi_Host {
short unsigned int sg_tablesize;
short unsigned int sg_prot_tablesize;
unsigned int max_sectors;
+ unsigned int max_segment_size;
unsigned long dma_boundary;
/*
* In scsi-mq mode, the number of hardware queues supported by the LLD.
Hello Christoph,
The value zero has another meaning for Scsi_Host.max_segment_size than
for queue_limits.max_segment_size. Shouldn't that be documented somewhere?
Thanks,
Bart.
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