scsi: qla2xxx: Use an on-stack completion in qla24xx_control_vp()

This patch reduces the size of struct srb.

Cc: Himanshu Madhani <hmadhani@marvell.com>
Cc: Giridhar Malavali <gmalavali@marvell.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_def.h

@@ -545,7 +545,7 @@ typedef struct srb {
 	u32 gen2;	/* scratch */
 	int rc;
 	int retry_count;
-	struct completion comp;
+	struct completion *comp;
 	wait_queue_head_t *cwaitq;
 	union {
 		struct srb_iocb iocb_cmd;

drivers/scsi/qla2xxx/qla_iocb.c

@@ -2570,7 +2570,6 @@ void qla2x00_init_timer(srb_t *sp, unsigned long tmo)
 	timer_setup(&sp->u.iocb_cmd.timer, qla2x00_sp_timeout, 0);
 	sp->u.iocb_cmd.timer.expires = jiffies + tmo * HZ;
 	sp->free = qla2x00_sp_free;
-	init_completion(&sp->comp);
 	if (IS_QLAFX00(sp->vha->hw) && sp->type == SRB_FXIOCB_DCMD)
 		init_completion(&sp->u.iocb_cmd.u.fxiocb.fxiocb_comp);
 	add_timer(&sp->u.iocb_cmd.timer);

drivers/scsi/qla2xxx/qla_mid.c

@@ -905,7 +905,8 @@ static void qla_ctrlvp_sp_done(void *s, int res)
 {
 	struct srb *sp = s;
 
-	complete(&sp->comp);
+	if (sp->comp)
+		complete(sp->comp);
 	/* don't free sp here. Let the caller do the free */
 }
 
@@ -922,6 +923,7 @@ int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
 	struct qla_hw_data *ha = vha->hw;
 	int	vp_index = vha->vp_idx;
 	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
+	DECLARE_COMPLETION_ONSTACK(comp);
 	srb_t *sp;
 
 	ql_dbg(ql_dbg_vport, vha, 0x10c1,
@@ -936,6 +938,7 @@ int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
 
 	sp->type = SRB_CTRL_VP;
 	sp->name = "ctrl_vp";
+	sp->comp = ∁
 	sp->done = qla_ctrlvp_sp_done;
 	sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
 	qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha) + 2);
@@ -953,7 +956,9 @@ int qla24xx_control_vp(scsi_qla_host_t *vha, int cmd)
 	ql_dbg(ql_dbg_vport, vha, 0x113f, "%s hndl %x submitted\n",
 	    sp->name, sp->handle);
 
-	wait_for_completion(&sp->comp);
+	wait_for_completion(&comp);
+	sp->comp = NULL;
+
 	rval = sp->rc;
 	switch (rval) {
 	case QLA_FUNCTION_TIMEOUT: