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_scan.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/scsi/scsi_scan.c') diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 408891cb14ff..d97597e6337e 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -292,7 +292,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, blk_queue_init_tags(sdev->request_queue, sdev->host->cmd_per_lun, shost->bqt); } - scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); + scsi_adjust_queue_depth(sdev, sdev->host->cmd_per_lun); scsi_sysfs_device_initialize(sdev); @@ -880,8 +880,10 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && - !(*bflags & BLIST_NOTQ)) + !(*bflags & BLIST_NOTQ)) { sdev->tagged_supported = 1; + sdev->simple_tags = 1; + } /* * Some devices (Texel CD ROM drives) have handshaking problems -- cgit