scsi: be2iscsi: Remove redundant iscsi_wrb desc memset

alloc_wrb_handle already does memset zero of iscsi_wrb descriptor so
remove redundant memset in WRB submission paths.

Add pwrb_handle NULL check before memsett'ing pwrb.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/be2iscsi/be_main.c

@@ -967,7 +967,9 @@ beiscsi_get_wrb_handle(struct hwi_wrb_context *pwrb_context,
 	else
 		pwrb_context->alloc_index++;
 	spin_unlock_bh(&pwrb_context->wrb_lock);
-	memset(pwrb_handle->pwrb, 0, sizeof(*pwrb_handle->pwrb));
+
+	if (pwrb_handle)
+		memset(pwrb_handle->pwrb, 0, sizeof(*pwrb_handle->pwrb));
 
 	return pwrb_handle;
 }
@@ -4718,7 +4720,6 @@ static int beiscsi_mtask(struct iscsi_task *task)
 
 	cid = beiscsi_conn->beiscsi_conn_cid;
 	pwrb = io_task->pwrb_handle->pwrb;
-	memset(pwrb, 0, sizeof(*pwrb));
 
 	if (is_chip_be2_be3r(phba)) {
 		AMAP_SET_BITS(struct amap_iscsi_wrb, cmdsn_itt, pwrb,

drivers/scsi/be2iscsi/be_mgmt.c

@@ -1350,7 +1350,6 @@ void beiscsi_offload_cxn_v0(struct beiscsi_offload_params *params,
 {
 	struct iscsi_wrb *pwrb = pwrb_handle->pwrb;
 
-	memset(pwrb, 0, sizeof(*pwrb));
 	AMAP_SET_BITS(struct amap_iscsi_target_context_update_wrb,
 		      max_send_data_segment_length, pwrb,
 		      params->dw[offsetof(struct amap_beiscsi_offload_params,
@@ -1422,8 +1421,6 @@ void beiscsi_offload_cxn_v2(struct beiscsi_offload_params *params,
 {
 	struct iscsi_wrb *pwrb = pwrb_handle->pwrb;
 
-	memset(pwrb, 0, sizeof(*pwrb));
-
 	AMAP_SET_BITS(struct amap_iscsi_target_context_update_wrb_v2,
 		      max_burst_length, pwrb, params->dw[offsetof
 		      (struct amap_beiscsi_offload_params,