[PATCH 11/13] hpsa: Convert SCSI LLD ->queuecommand() for host_lock less operation

Don Brace
2014-11-14T23:25:44Z

From: Nicholas Bellinger <nab@linux-iscsi.org>

There isn't anything in hpsa that requires the host lock to be held
during queuecommand.

Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Stephen M. Cameron <stephenmcameron@gmail.com>
---
drivers/scsi/hpsa.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 58f6847..761612d 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -3881,8 +3881,11 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
dev->scsi3addr);
}

-static int hpsa_scsi_queue_command_lck(struct scsi_cmnd *cmd,
- void (*done)(struct scsi_cmnd *))
+/*
+ * Running in struct Scsi_Host->host_lock less mode using LLD internal
+ * struct ctlr_info *h->lock w/ spin_lock_irqsave() protection.
+ */
+static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
{
struct ctlr_info *h;
struct hpsa_scsi_dev_t *dev;
@@ -3895,14 +3898,14 @@ static int hpsa_scsi_queue_command_lck(struct scsi_cmnd *cmd,
dev = cmd->device->hostdata;
if (!dev) {
cmd->result = DID_NO_CONNECT << 16;
- done(cmd);
+ cmd->scsi_done(cmd);
return 0;
}
memcpy(scsi3addr, dev->scsi3addr, sizeof(scsi3addr));

if (unlikely(lockup_detected(h))) {
cmd->result = DID_ERROR << 16;
- done(cmd);
+ cmd->scsi_done(cmd);
return 0;
}
c = cmd_alloc(h);
@@ -3912,9 +3915,6 @@ static int hpsa_scsi_queue_command_lck(struct scsi_cmnd *cmd,
}

/* Fill in the command list header */
-
- cmd->scsi_done = done; /* save this for use by completion code */
-
/* save c in case we have to abort it */
cmd->host_scribble = (unsigned char *) c;

@@ -4005,8 +4005,6 @@ static int hpsa_scsi_queue_command_lck(struct scsi_cmnd *cmd,
return 0;
}

-static DEF_SCSI_QCMD(hpsa_scsi_queue_command)
-
static int do_not_scan_if_controller_locked_up(struct ctlr_info *h)
{
unsigned long flags;