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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>
This commit is contained in:
James Smart 2017-05-15 15:20:39 -07:00 committed by Martin K. Petersen
parent 845d9e8df2
commit 0c9c6a7514
2 changed files with 9 additions and 5 deletions
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8
drivers/scsi/lpfc/lpfc.h
View File

@ -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];
}

6
drivers/scsi/lpfc/lpfc_hbadisc.c
View File

@ -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 */