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scsi: don't set tagging state from scsi_adjust_queue_depth

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Remove the tagged argument from scsi_adjust_queue_depth, and just let it
handle the queue depth.  For most drivers those two are fairly separate,
given that most modern drivers don't care about the SCSI "tagged" status
of a command at all, and many old drivers allow queuing of multiple
untagged commands in the driver.

Instead we start out with the ->simple_tags flag set before calling
->slave_configure, which is how all drivers actually looking at
->simple_tags except for one worke anyway.  The one other case looks
broken, but I've kept the behavior as-is for now.

Except for that we only change ->simple_tags from the ->change_queue_type,
and when rejecting a tag message in a single driver, so keeping this
churn out of scsi_adjust_queue_depth is a clear win.

Now that the usage of scsi_adjust_queue_depth is more obvious we can
also remove all the trivial instances in ->slave_alloc or ->slave_configure
that just set it to the cmd_per_lun default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig
2014-11-03 20:15:14 +01:00
parent 2ecb204d07
commit c8b09f6fb6
57 changed files with 120 additions and 260 deletions
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17
drivers/scsi/esp_scsi.c
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@@ -2402,27 +2402,14 @@ static int esp_slave_configure(struct scsi_device *dev)
{
struct esp *esp = shost_priv(dev->host);
struct esp_target_data *tp = &esp->target[dev->id];
int goal_tags, queue_depth;
goal_tags = 0;
if (dev->tagged_supported) {
/* XXX make this configurable somehow XXX */
goal_tags = ESP_DEFAULT_TAGS;
int goal_tags = min(ESP_DEFAULT_TAGS, ESP_MAX_TAG);
if (goal_tags > ESP_MAX_TAG)
goal_tags = ESP_MAX_TAG;
scsi_adjust_queue_depth(dev, goal_tags);
}
queue_depth = goal_tags;
if (queue_depth < dev->host->cmd_per_lun)
queue_depth = dev->host->cmd_per_lun;
if (goal_tags) {
scsi_adjust_queue_depth(dev, MSG_ORDERED_TAG, queue_depth);
} else {
scsi_adjust_queue_depth(dev, 0, queue_depth);
}
tp->flags |= ESP_TGT_DISCONNECT;
if (!spi_initial_dv(dev->sdev_target))