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scsi: don't allow setting of queue_depth bigger than can_queue

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We won't ever queue more commands than the host allows.  Instead of
letting drivers either reject or ignore this case handle it in
common code.  Note that various driver use internal constant or
variables that are assigned to both shost->can_queue and checked
in ->change_queue_depth - I did remove those checks as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Christoph Hellwig 2014-11-13 14:27:41 +01:00
parent c40ecc12cf
commit 1e6f241604
9 changed files with 3 additions and 30 deletions
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8
drivers/infiniband/ulp/srp/ib_srp.c
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@ -2410,14 +2410,8 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
static int
srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
{
struct Scsi_Host *shost = sdev->host;
int max_depth;
max_depth = shost->can_queue;
if (!sdev->tagged_supported)
max_depth = 1;
if (qdepth > max_depth)
qdepth = max_depth;
qdepth = 1;
scsi_adjust_queue_depth(sdev, qdepth);
return sdev->queue_depth;
}

2
drivers/scsi/3w-9xxx.c
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@ -196,8 +196,6 @@ static int twa_change_queue_depth(struct scsi_device *sdev, int queue_depth,
if (reason != SCSI_QDEPTH_DEFAULT)
return -EOPNOTSUPP;
if (queue_depth > TW_Q_LENGTH-2)
queue_depth = TW_Q_LENGTH-2;
scsi_adjust_queue_depth(sdev, queue_depth);
return queue_depth;
} /* End twa_change_queue_depth() */

2
drivers/scsi/3w-sas.c
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@ -198,8 +198,6 @@ static int twl_change_queue_depth(struct scsi_device *sdev, int queue_depth,
if (reason != SCSI_QDEPTH_DEFAULT)
return -EOPNOTSUPP;
if (queue_depth > TW_Q_LENGTH-2)
queue_depth = TW_Q_LENGTH-2;
scsi_adjust_queue_depth(sdev, queue_depth);
return queue_depth;
} /* End twl_change_queue_depth() */

2
drivers/scsi/3w-xxxx.c
View File

@ -530,8 +530,6 @@ static int tw_change_queue_depth(struct scsi_device *sdev, int queue_depth,
if (reason != SCSI_QDEPTH_DEFAULT)
return -EOPNOTSUPP;
if (queue_depth > TW_Q_LENGTH-2)
queue_depth = TW_Q_LENGTH-2;
scsi_adjust_queue_depth(sdev, queue_depth);
return queue_depth;
} /* End tw_change_queue_depth() */

5
drivers/scsi/hpsa.c
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@ -4082,11 +4082,6 @@ static int hpsa_change_queue_depth(struct scsi_device *sdev,
if (reason != SCSI_QDEPTH_DEFAULT)
return -ENOTSUPP;
if (qdepth < 1)
qdepth = 1;
else
if (qdepth > h->nr_cmds)
qdepth = h->nr_cmds;
scsi_adjust_queue_depth(sdev, qdepth);
return sdev->queue_depth;
}

2
drivers/scsi/megaraid/megaraid_mbox.c
View File

@ -347,8 +347,6 @@ static int megaraid_change_queue_depth(struct scsi_device *sdev, int qdepth,
if (reason != SCSI_QDEPTH_DEFAULT)
return -EOPNOTSUPP;
if (qdepth > MBOX_MAX_SCSI_CMDS)
qdepth = MBOX_MAX_SCSI_CMDS;
scsi_adjust_queue_depth(sdev, qdepth);
return sdev->queue_depth;
}

2
drivers/scsi/megaraid/megaraid_sas_base.c
View File

@ -2597,8 +2597,6 @@ static int megasas_change_queue_depth(struct scsi_device *sdev,
if (reason != SCSI_QDEPTH_DEFAULT)
return -EOPNOTSUPP;
if (queue_depth > sdev->host->can_queue)
queue_depth = sdev->host->can_queue;
scsi_adjust_queue_depth(sdev, queue_depth);
return queue_depth;

2
drivers/scsi/scsi_sysfs.c
View File

@ -877,7 +877,7 @@ sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
depth = simple_strtoul(buf, NULL, 0);
if (depth < 1)
if (depth < 1 || depth > sht->can_queue)
return -EINVAL;
retval = sht->change_queue_depth(sdev, depth,

8
drivers/scsi/vmw_pvscsi.c
View File

@ -508,20 +508,14 @@ static int pvscsi_change_queue_depth(struct scsi_device *sdev,
int qdepth,
int reason)
{
int max_depth;
struct Scsi_Host *shost = sdev->host;
if (reason != SCSI_QDEPTH_DEFAULT)
/*
* We support only changing default.
*/
return -EOPNOTSUPP;
max_depth = shost->can_queue;
if (!sdev->tagged_supported)
max_depth = 1;
if (qdepth > max_depth)
qdepth = max_depth;
qdepth = 1;
scsi_adjust_queue_depth(sdev, qdepth);
if (sdev->inquiry_len > 7)