From c8b09f6fb67df7fc1b51ced1037fa9b677428149 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 3 Nov 2014 20:15:14 +0100 Subject: scsi: don't set tagging state from scsi_adjust_queue_depth 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 Reviewed-by: Mike Christie Reviewed-by: Hannes Reinecke Reviewed-by: Martin K. Petersen --- drivers/scsi/scsi.c | 25 +++++-------------------- 1 file changed, 5 insertions(+), 20 deletions(-) (limited to 'drivers/scsi/scsi.c') diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index a3426f1bf0dd..106fa2f886d2 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -744,8 +744,6 @@ void scsi_finish_command(struct scsi_cmnd *cmd) /** * scsi_adjust_queue_depth - Let low level drivers change a device's queue depth * @sdev: SCSI Device in question - * @tagged: Do we use tagged queueing (non-0) or do we treat - * this device as an untagged device (0) * @tags: Number of tags allowed if tagged queueing enabled, * or number of commands the low level driver can * queue up in non-tagged mode (as per cmd_per_lun). @@ -759,7 +757,7 @@ void scsi_finish_command(struct scsi_cmnd *cmd) * currently active and whether or not it even has the * command blocks built yet. */ -void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags) +void scsi_adjust_queue_depth(struct scsi_device *sdev, int tags) { unsigned long flags; @@ -787,20 +785,6 @@ void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags) } sdev->queue_depth = tags; - switch (tagged) { - case 0: - sdev->simple_tags = 0; - break; - case MSG_ORDERED_TAG: - case MSG_SIMPLE_TAG: - sdev->simple_tags = 1; - break; - default: - sdev->simple_tags = 0; - sdev_printk(KERN_WARNING, sdev, - "scsi_adjust_queue_depth, bad queue type, " - "disabled\n"); - } out: spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); } @@ -848,11 +832,12 @@ int scsi_track_queue_full(struct scsi_device *sdev, int depth) return 0; if (sdev->last_queue_full_depth < 8) { /* Drop back to untagged */ - scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); + scsi_set_tag_type(sdev, 0); + scsi_adjust_queue_depth(sdev, sdev->host->cmd_per_lun); return -1; } - scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); + scsi_adjust_queue_depth(sdev, depth); return depth; } EXPORT_SYMBOL(scsi_track_queue_full); @@ -867,7 +852,7 @@ int scsi_change_queue_type(struct scsi_device *sdev, int tag_type) if (!sdev->tagged_supported) return 0; - scsi_adjust_queue_depth(sdev, tag_type, sdev->queue_depth); + scsi_set_tag_type(sdev, tag_type); return tag_type; } -- cgit v1.2.2