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authorJames Smart <jsmart2021@gmail.com>2017-05-16 01:20:39 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2017-05-17 04:17:54 +0300
commit0c9c6a75141810acade82add4f4708959a5d3a1d (patch)
tree5a0490280fde16d0cde18363d9bf4fadf97fd90c /drivers/scsi
parent845d9e8df2fa879e6494e786f290e1fd5560ac8c (diff)
downloadlinux-0c9c6a75141810acade82add4f4708959a5d3a1d.tar.xz
scsi: lpfc: Fix system crash when port is reset.
The driver panic when using the els_wq during port reset. Check for NULL els_wq before dereferencing. Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <james.smart@broadcom.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/lpfc/lpfc.h8
-rw-r--r--drivers/scsi/lpfc/lpfc_hbadisc.c6
2 files changed, 9 insertions, 5 deletions
diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index 6d7840b096e6..62571fa9c6ad 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -1228,7 +1228,11 @@ lpfc_sli_read_hs(struct lpfc_hba *phba)
static inline struct lpfc_sli_ring *
lpfc_phba_elsring(struct lpfc_hba *phba)
{
- if (phba->sli_rev == LPFC_SLI_REV4)
- return phba->sli4_hba.els_wq->pring;
+ if (phba->sli_rev == LPFC_SLI_REV4) {
+ if (phba->sli4_hba.els_wq)
+ return phba->sli4_hba.els_wq->pring;
+ else
+ return NULL;
+ }
return &phba->sli.sli3_ring[LPFC_ELS_RING];
}
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index 0482c5580331..dcc9b3858778 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -693,9 +693,9 @@ lpfc_work_done(struct lpfc_hba *phba)
pring = lpfc_phba_elsring(phba);
status = (ha_copy & (HA_RXMASK << (4*LPFC_ELS_RING)));
status >>= (4*LPFC_ELS_RING);
- if ((status & HA_RXMASK) ||
- (pring->flag & LPFC_DEFERRED_RING_EVENT) ||
- (phba->hba_flag & HBA_SP_QUEUE_EVT)) {
+ if (pring && (status & HA_RXMASK ||
+ pring->flag & LPFC_DEFERRED_RING_EVENT ||
+ phba->hba_flag & HBA_SP_QUEUE_EVT)) {
if (pring->flag & LPFC_STOP_IOCB_EVENT) {
pring->flag |= LPFC_DEFERRED_RING_EVENT;
/* Set the lpfc data pending flag */