提交 11206081 编写于 作者: J Jayamohan Kallickal 提交者: Christoph Hellwig

be2iscsi: Fix processing cqe for cxn whose endpoint is freed

 During heavy IO in multipath environment with many active sessions
 and port-bouncing happening, there is a race condition because of
 which beiscsi_prcess_cqe() gets called for a connection whose
 endpoint is freed.

 Checking endpoint reference for a connection before processing in
 beiscsi_process_cq().
Signed-off-by: NMinh Tran <minhduc.tran@emulex.com>
Signed-off-by: NJohn Soni Jose <sony.john-n@emulex.com>
Signed-off-by: NJayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
上级 23188167
......@@ -2110,6 +2110,16 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
cri_index = BE_GET_CRI_FROM_CID(cid);
ep = phba->ep_array[cri_index];
if (unlikely(ep == NULL)) {
/* connection has already been freed
* just move on to next one
*/
beiscsi_log(phba, KERN_WARNING,
BEISCSI_LOG_INIT,
"BM_%d : proc cqe of disconn ep: cid %d\n",
cid);
goto proc_next_cqe;
}
beiscsi_ep = ep->dd_data;
beiscsi_conn = beiscsi_ep->conn;
......@@ -2219,6 +2229,7 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
break;
}
proc_next_cqe:
AMAP_SET_BITS(struct amap_sol_cqe, valid, sol, 0);
queue_tail_inc(cq);
sol = queue_tail_node(cq);
......
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