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authorFinn Thain <fthain@telegraphics.com.au>2018-10-16 16:31:25 +1100
committerMartin K. Petersen <martin.petersen@oracle.com>2018-10-17 21:37:26 -0400
commit87c58ef5a57f46b1d78117317a7d8806ad16f404 (patch)
treefc924db5c7cf5584984116b3c3d35aab5cd5204a /drivers/scsi
parentfd47d919d0c336e7c22862b51ee94927ffea227a (diff)
downloadlinux-87c58ef5a57f46b1d78117317a7d8806ad16f404.tar.bz2
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')
-rw-r--r--drivers/scsi/esp_scsi.c11
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