[PATCH 25/34] qla2xxx: Use an on-stack completion in qla24xx_control_vp()

[Bart Van Assche]

This patch reduces the size of struct srb.

Cc: Himanshu Madhani <hmadh...@marvell.com>
Cc: Giridhar Malavali <gmalav...@marvell.com>
Signed-off-by: Bart Van Assche <bvanass...@acm.org>
---
 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(-)

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index c9f0169b21ea..6dd2d41713c9 100644
--- 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;
diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index 7ab157c079ca..60f6685cb342 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/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);
diff --git a/drivers/scsi/qla2xxx/qla_mid.c b/drivers/scsi/qla2xxx/qla_mid.c
index 099d8e9851cb..b2977e49356b 100644
--- 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, 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 = &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:
-- 
2.21.0.196.g041f5ea1cf98