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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>
This commit is contained in:
Finn Thain 2018-10-16 16:31:25 +11:00 committed by Martin K. Petersen
parent fd47d919d0
commit 87c58ef5a5
1 changed files with 1 additions and 10 deletions
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11
drivers/scsi/esp_scsi.c
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@ -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