From 7438273fa23bea6d1e647e66c451570b86e2758b Mon Sep 17 00:00:00 2001 From: James Smart Date: Thu, 24 May 2018 21:08:59 -0700 Subject: [PATCH] scsi: lpfc: Fix crash in blk_mq layer when executing modprobe -r lpfc modprobe -r lpfc produces the following: Call Trace: __blk_mq_run_hw_queue+0xa2/0xb0 __blk_mq_delay_run_hw_queue+0x9d/0xb0 ? blk_mq_hctx_has_pending+0x32/0x80 blk_mq_run_hw_queue+0x50/0xd0 blk_mq_sched_insert_request+0x110/0x1b0 blk_execute_rq_nowait+0x76/0x180 nvme_keep_alive_work+0x8a/0xd0 [nvme_core] process_one_work+0x17f/0x440 worker_thread+0x126/0x3c0 ? manage_workers.isra.24+0x2a0/0x2a0 kthread+0xd1/0xe0 ? insert_kthread_work+0x40/0x40 ret_from_fork_nospec_begin+0x21/0x21 ? insert_kthread_work+0x40/0x40 However, rmmod lpfc would run correctly. When an nvme remoteport is unregistered with the host nvme transport, it needs to set the remoteport->dev_loss_tmo value 0 to indicate an immediate termination of device loss and prevent any further keep alives to that rport. The driver was never setting dev_loss_tmo causing the nvme transport to continue to send the keep alive. Signed-off-by: Dick Kennedy Signed-off-by: James Smart Reviewed-by: Hannes Reinecke Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc_nvme.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c index 288dd3c..76a5a99 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.c +++ b/drivers/scsi/lpfc/lpfc_nvme.c @@ -2862,6 +2862,15 @@ lpfc_nvme_unregister_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp) * The transport will update it. */ ndlp->upcall_flags |= NLP_WAIT_FOR_UNREG; + + /* Don't let the host nvme transport keep sending keep-alives + * on this remoteport. Vport is unloading, no recovery. The + * return values is ignored. The upcall is a courtesy to the + * transport. + */ + if (vport->load_flag & FC_UNLOADING) + (void)nvme_fc_set_remoteport_devloss(remoteport, 0); + ret = nvme_fc_unregister_remoteport(remoteport); if (ret != 0) { lpfc_nlp_put(ndlp); -- 2.7.4