diff options
| author | Finn Thain <fthain@telegraphics.com.au> | 2018-10-16 08:31:25 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-10-18 04:37:26 +0300 |
| commit | 87c58ef5a57f46b1d78117317a7d8806ad16f404 (patch) | |
| tree | fc924db5c7cf5584984116b3c3d35aab5cd5204a /drivers/scsi/esp_scsi.c | |
| parent | fd47d919d0c336e7c22862b51ee94927ffea227a (diff) | |
| download | linux-87c58ef5a57f46b1d78117317a7d8806ad16f404.tar.xz | |
scsi: esp_scsi: Grant disconnect privilege for untagged commands
A SCSI device is not granted disconnect privilege by an esp_scsi host
unless that device has its simple_tags flag set. However, a device may
support disconnect/reselect and not support command queueing. Allow such
devices to disconnect and thereby improve bus utilization.
Drop the redundant 'lp' check. The mid-layer invokes .slave_alloc and
.slave_destroy in such a way that we may rely on scmd->device->hostdata
for as long as scmd belongs to the low-level driver.
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/esp_scsi.c')
| -rw-r--r-- | drivers/scsi/esp_scsi.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c index cba58cf612e2..692461443103 100644 --- a/drivers/scsi/esp_scsi.c +++ b/drivers/scsi/esp_scsi.c @@ -736,7 +736,6 @@ static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp) static void esp_maybe_execute_command(struct esp *esp) { struct esp_target_data *tp; - struct esp_lun_data *lp; struct scsi_device *dev; struct scsi_cmnd *cmd; struct esp_cmd_entry *ent; @@ -762,7 +761,6 @@ static void esp_maybe_execute_command(struct esp *esp) tgt = dev->id; lun = dev->lun; tp = &esp->target[tgt]; - lp = dev->hostdata; list_move(&ent->list, &esp->active_cmds); @@ -818,14 +816,7 @@ static void esp_maybe_execute_command(struct esp *esp) } build_identify: - /* If we don't have a lun-data struct yet, we're probing - * so do not disconnect. Also, do not disconnect unless - * we have a tag on this command. - */ - if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0]) - *p++ = IDENTIFY(1, lun); - else - *p++ = IDENTIFY(0, lun); + *p++ = IDENTIFY(tp->flags & ESP_TGT_DISCONNECT, lun); if (ent->tag[0] && esp->rev == ESP100) { /* ESP100 lacks select w/atn3 command, use select |