From: James Smart <jsmart2021@gmail.com>
Date: Thu, 29 Nov 2018 16:09:32 -0800
Subject: [PATCH] scsi: lpfc: Fix kernel Oops due to null pring pointers
Git-commit: 5a9eeff57f340238c39c95d8e7e54c96fc722de7
Patch-mainline: v5.0-rc1
References: bsc#1118215
Driver is hitting null pring pointers in lpfc_do_work().
Pointer assignment occurs based on SLI-revision. If recovering after an
error, its possible the sli revision for the port was cleared, making the
lpfc_phba_elsring() not return a ring pointer, thus the null pointer.
Add SLI revision checking to lpfc_phba_elsring() and status checking to all
callers.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/scsi/lpfc/lpfc.h | 6 ++++++
drivers/scsi/lpfc/lpfc_els.c | 2 ++
drivers/scsi/lpfc/lpfc_init.c | 7 ++++++-
drivers/scsi/lpfc/lpfc_sli.c | 2 ++
4 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index c23c29b451c2..b37e0caf0781 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -1277,6 +1277,12 @@ lpfc_sli_read_hs(struct lpfc_hba *phba)
static inline struct lpfc_sli_ring *
lpfc_phba_elsring(struct lpfc_hba *phba)
{
+ /* Return NULL if sli_rev has become invalid due to bad fw */
+ if (phba->sli_rev != LPFC_SLI_REV4 &&
+ phba->sli_rev != LPFC_SLI_REV3 &&
+ phba->sli_rev != LPFC_SLI_REV2)
+ return NULL;
+
if (phba->sli_rev == LPFC_SLI_REV4) {
if (phba->sli4_hba.els_wq)
return phba->sli4_hba.els_wq->pring;
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 902234a1fcfb..3f21338d95d1 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1343,6 +1343,8 @@ lpfc_els_abort_flogi(struct lpfc_hba *phba)
Fabric_DID);
pring = lpfc_phba_elsring(phba);
+ if (unlikely(!pring))
+ return -EIO;
/*
* Check the txcmplq for an iocb that matches the nport the driver is
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index e95a768575b0..647a037d6f4d 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -1797,7 +1797,12 @@ lpfc_sli4_port_sta_fn_reset(struct lpfc_hba *phba, int mbx_action,
lpfc_offline(phba);
/* release interrupt for possible resource change */
lpfc_sli4_disable_intr(phba);
- lpfc_sli_brdrestart(phba);
+ rc = lpfc_sli_brdrestart(phba);
+ if (rc) {
+ lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+ "6309 Failed to restart board\n");
+ return rc;
+ }
/* request and enable interrupt */
intr_mode = lpfc_sli4_enable_intr(phba, phba->intr_mode);
if (intr_mode == LPFC_INTR_ERROR) {
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 353652fbc954..9821ab81c2f9 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -4687,6 +4687,8 @@ lpfc_sli_brdrestart_s4(struct lpfc_hba *phba)
hba_aer_enabled = phba->hba_flag & HBA_AER_ENABLED;
rc = lpfc_sli4_brdreset(phba);
+ if (rc)
+ return rc;
spin_lock_irq(&phba->hbalock);
phba->pport->stopped = 0;
--
2.16.4