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authorMartin K. Petersen <martin.petersen@oracle.com>2010-02-26 00:20:39 -0500
committerJens Axboe <jens.axboe@oracle.com>2010-02-26 13:58:08 +0100
commit8a78362c4eefc1deddbefe2c7f38aabbc2429d6b (patch)
treec095d95af1aec0f9cee5975b1dcdc6bc1d17d401 /drivers/scsi
parent086fa5ff0854c676ec333760f4c0154b3b242616 (diff)
block: Consolidate phys_segment and hw_segment limits
Except for SCSI no device drivers distinguish between physical and hardware segment limits. Consolidate the two into a single segment limit. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/ibmvscsi/ibmvfc.c4
-rw-r--r--drivers/scsi/scsi_lib.c4
-rw-r--r--drivers/scsi/sg.c6
-rw-r--r--drivers/scsi/st.c3
4 files changed, 7 insertions, 10 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 87b536a97cb..732f6d35b4a 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -4195,7 +4195,7 @@ static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
if (tgt->service_parms.class3_parms[0] & 0x80000000)
rport->supported_classes |= FC_COS_CLASS3;
if (rport->rqst_q)
- blk_queue_max_hw_segments(rport->rqst_q, 1);
+ blk_queue_max_segments(rport->rqst_q, 1);
} else
tgt_dbg(tgt, "rport add failed\n");
spin_unlock_irqrestore(vhost->host->host_lock, flags);
@@ -4669,7 +4669,7 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
}
if (shost_to_fc_host(shost)->rqst_q)
- blk_queue_max_hw_segments(shost_to_fc_host(shost)->rqst_q, 1);
+ blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
dev_set_drvdata(dev, vhost);
spin_lock(&ibmvfc_driver_lock);
list_add_tail(&vhost->queue, &ibmvfc_head);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index ac3cca74bdf..f8fbf47377a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1624,8 +1624,8 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost,
/*
* this limit is imposed by hardware restrictions
*/
- blk_queue_max_hw_segments(q, shost->sg_tablesize);
- blk_queue_max_phys_segments(q, SCSI_MAX_SG_CHAIN_SEGMENTS);
+ blk_queue_max_segments(q, min_t(unsigned short, shost->sg_tablesize,
+ SCSI_MAX_SG_CHAIN_SEGMENTS));
blk_queue_max_hw_sectors(q, shost->max_sectors);
blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 040f751809e..c996d98636f 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -287,8 +287,7 @@ sg_open(struct inode *inode, struct file *filp)
if (list_empty(&sdp->sfds)) { /* no existing opens on this device */
sdp->sgdebug = 0;
q = sdp->device->request_queue;
- sdp->sg_tablesize = min(queue_max_hw_segments(q),
- queue_max_phys_segments(q));
+ sdp->sg_tablesize = queue_max_segments(q);
}
if ((sfp = sg_add_sfp(sdp, dev)))
filp->private_data = sfp;
@@ -1376,8 +1375,7 @@ static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
sdp->device = scsidp;
INIT_LIST_HEAD(&sdp->sfds);
init_waitqueue_head(&sdp->o_excl_wait);
- sdp->sg_tablesize = min(queue_max_hw_segments(q),
- queue_max_phys_segments(q));
+ sdp->sg_tablesize = queue_max_segments(q);
sdp->index = k;
kref_init(&sdp->d_ref);
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index d04ea9a6f67..f67d1a159aa 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -3983,8 +3983,7 @@ static int st_probe(struct device *dev)
return -ENODEV;
}
- i = min(queue_max_hw_segments(SDp->request_queue),
- queue_max_phys_segments(SDp->request_queue));
+ i = queue_max_segments(SDp->request_queue);
if (st_max_sg_segs < i)
i = st_max_sg_segs;
buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);