From: Bart Van Assche <bvanassche@acm.org>
Date: Wed, 17 Apr 2019 14:44:34 -0700
Subject: scsi: qla2xxx: Use an on-stack completion in qla24xx_control_vp()
Patch-mainline: v5.2-rc1
Git-commit: 982cc4be05d6d0d8b15b1340416737ad60bddcae
References: bsc#1082635 bsc#1123034 bsc#1131304 bsc#1127988 bsc#1141340 bsc#1143706

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>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/scsi/qla2xxx/qla_def.h  |    2 +-
 drivers/scsi/qla2xxx/qla_iocb.c |    1 -
 drivers/scsi/qla2xxx/qla_mid.c  |    9 +++++++--
 3 files changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/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;
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -2577,7 +2577,6 @@ void qla2x00_init_timer(srb_t *sp, unsig
 	sp->u.iocb_cmd.timer.data = (unsigned long)sp;
 	sp->u.iocb_cmd.timer.function = qla2x00_sp_timeout;
 	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);
--- a/drivers/scsi/qla2xxx/qla_mid.c
+++ b/drivers/scsi/qla2xxx/qla_mid.c
@@ -905,7 +905,8 @@ static void qla_ctrlvp_sp_done(void *s,
 {
 	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 *
 	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 *
 
 	sp->type = SRB_CTRL_VP;
 	sp->name = "ctrl_vp";
+	sp->comp = &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 *
 	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: