From: Dick Kennedy <dick.kennedy@broadcom.com>
Date: Wed, 23 Aug 2017 16:55:38 -0700
Subject: scsi: lpfc: Fix crash in lpfc nvmet when fc port is reset
Patch-mainline: v4.14-rc1
Git-commit: 4b40d02b8b2bd549c7751a3c4629077ea5f9a1fd
References: bsc#1050239,FATE#322918
In adapter reset tests, an oops was seen with a NULL pointer in
lpfc_free_rq_buffer+0x20/0x60
The driver is failing to properly repost the nvmet sgl list when
recovering from the reset. Thus the driver eventually trys to walk an
errant buffer list.
Corrected the sgl buffer recovery as well as strengthening the
initialization of the bufferlist.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
drivers/scsi/lpfc/lpfc_init.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -3226,6 +3226,13 @@ lpfc_offline(struct lpfc_hba *phba)
/* stop port and all timers associated with this hba */
lpfc_stop_port(phba);
+
+ /* Tear down the local and target port registrations. The
+ * nvme transports need to cleanup.
+ */
+ lpfc_nvmet_destroy_targetport(phba);
+ lpfc_nvme_destroy_localport(phba->pport);
+
vports = lpfc_create_vport_work_array(phba);
if (vports != NULL)
for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++)
@@ -6516,6 +6523,12 @@ lpfc_free_nvmet_sgl_list(struct lpfc_hba
lpfc_nvmet_buf_free(phba, sglq_entry->virt, sglq_entry->phys);
kfree(sglq_entry);
}
+
+ /* Update the nvmet_xri_cnt to reflect no current sgls.
+ * The next initialization cycle sets the count and allocates
+ * the sgls over again.
+ */
+ phba->sli4_hba.nvmet_xri_cnt = 0;
}
/**
@@ -8301,6 +8314,9 @@ lpfc_sli4_queue_create(struct lpfc_hba *
goto out_error;
}
+ /* Put list in known state in case driver load fails. */
+ INIT_LIST_HEAD(&qdesc->rqbp->rqb_buffer_list);
+
/* Create NVMET Receive Queue for data */
qdesc = lpfc_sli4_queue_alloc(phba,
phba->sli4_hba.rq_esize,