From: Daniel Wagner <dwagner@suse.de>
Date: Tue, 29 Sep 2020 09:38:02 +0200
Subject: scsi: qla2xxx: Do not consume srb greedily
Patch-mainline: v5.10-rc1
Git-commit: 657ed8a8a61b15eba70f7c4e2b61f643cf1ba91f
References: bsc#1172538 bsc#1179142 bsc#1179810

qla2xx_process_get_sp_from_handle() will clear the slot in which the
current srb is stored. As a result it can't be used in
qla24xx_process_mbx_iocb_response() to check for consistency and later
again in qla24xx_mbx_iocb_entry().

Move the consistency check directly into qla24xx_mbx_iocb_entry() and avoid
the double call or any open coding of the
qla2xx_process_get_sp_from_handle() functionality.

Link: https://lore.kernel.org/r/20200929073802.18770-1-dwagner@suse.de
Fixes: 31a3271ff11b ("scsi: qla2xxx: Handle incorrect entry_type entries")
Reviewed-by: Arun Easi <aeasi@marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
 drivers/scsi/qla2xxx/qla_isr.c |   42 ++++++++++++++---------------------------
 1 file changed, 15 insertions(+), 27 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1839,6 +1839,7 @@ qla24xx_mbx_iocb_entry(scsi_qla_host_t *
     struct mbx_24xx_entry *pkt)
 {
 	const char func[] = "MBX-IOCB2";
+	struct qla_hw_data *ha = vha->hw;
 	srb_t *sp;
 	struct srb_iocb *si;
 	u16 sz, i;
@@ -1848,6 +1849,18 @@ qla24xx_mbx_iocb_entry(scsi_qla_host_t *
 	if (!sp)
 		return;
 
+	if (sp->type == SRB_SCSI_CMD ||
+	    sp->type == SRB_NVME_CMD ||
+	    sp->type == SRB_TM_CMD) {
+		ql_log(ql_log_warn, vha, 0x509d,
+			"Inconsistent event entry type %d\n", sp->type);
+		if (IS_P3P_TYPE(ha))
+			set_bit(FCOE_CTX_RESET_NEEDED, &vha->dpc_flags);
+		else
+			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
+		return;
+	}
+
 	si = &sp->u.iocb_cmd;
 	sz = min(ARRAY_SIZE(pkt->mb), ARRAY_SIZE(sp->u.iocb_cmd.u.mbx.in_mb));
 
@@ -3400,32 +3413,6 @@ void qla24xx_nvme_ls4_iocb(struct scsi_q
 	sp->done(sp, comp_status);
 }
 
-static void qla24xx_process_mbx_iocb_response(struct scsi_qla_host *vha,
-	struct rsp_que *rsp, struct sts_entry_24xx *pkt)
-{
-	struct qla_hw_data *ha = vha->hw;
-	srb_t *sp;
-	static const char func[] = "MBX-IOCB2";
-
-	sp = qla2x00_get_sp_from_handle(vha, func, rsp->req, pkt);
-	if (!sp)
-		return;
-
-	if (sp->type == SRB_SCSI_CMD ||
-	    sp->type == SRB_NVME_CMD ||
-	    sp->type == SRB_TM_CMD) {
-		ql_log(ql_log_warn, vha, 0x509d,
-			"Inconsistent event entry type %d\n", sp->type);
-		if (IS_P3P_TYPE(ha))
-			set_bit(FCOE_CTX_RESET_NEEDED, &vha->dpc_flags);
-		else
-			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
-		return;
-	}
-
-	qla24xx_mbx_iocb_entry(vha, rsp->req, (struct mbx_24xx_entry *)pkt);
-}
-
 /**
  * qla24xx_process_response_queue() - Process response queue entries.
  * @vha: SCSI driver HA context
@@ -3535,7 +3522,8 @@ void qla24xx_process_response_queue(stru
 			    (struct abort_entry_24xx *)pkt);
 			break;
 		case MBX_IOCB_TYPE:
-			qla24xx_process_mbx_iocb_response(vha, rsp, pkt);
+			qla24xx_mbx_iocb_entry(vha, rsp->req,
+			    (struct mbx_24xx_entry *)pkt);
 			break;
 		case VP_CTRL_IOCB_TYPE:
 			qla_ctrlvp_completed(vha, rsp->req,