From: James Smart <jsmart2021@gmail.com>
Date: Fri, 16 Jun 2017 05:56:41 +0000 (-0700)
Subject: scsi: lpfc: Fix system panic when express lane enabled.
X-Git-Tag: v4.13-rc1~136^2~100
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d41b65bcdc43fed82ea6b3c006a268df6c53e80d;p=karo-tx-linux.git

scsi: lpfc: Fix system panic when express lane enabled.

There is a null pointer dereference that can happen in the FOF interrupt
handler.

The driver was not setting up cq->assoc_qp_for sli4_hba->oas_cq.

Initialize cq->assoc_qp before accessing it.

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>
---

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 040575adf9c6..4f2cc395597e 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -13560,6 +13560,9 @@ lpfc_sli4_fof_handle_eqe(struct lpfc_hba *phba, struct lpfc_eqe *eqe)
 		return;
 	}
 
+	/* Save EQ associated with this CQ */
+	cq->assoc_qp = phba->sli4_hba.fof_eq;
+
 	/* Process all the entries to the OAS CQ */
 	while ((cqe = lpfc_sli4_cq_get(cq))) {
 		workposted |= lpfc_sli4_fp_handle_cqe(phba, cq, cqe);