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nvmet-fc: avoid deadlock on delete association path 

When deleting an association the shutdown path is deadlocking because we
try to flush the nvmet_wq nested. Avoid this by deadlock by deferring
the put work into its own work item.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Daniel Wagner 2024-01-31 09:51:10 +01:00 committed by Keith Busch
parent 3146345c2e
commit 710c69dbac
1 changed files with 13 additions and 3 deletions
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16
drivers/nvme/target/fc.c
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@ -111,6 +111,8 @@ struct nvmet_fc_tgtport {
struct nvmet_fc_port_entry *pe;
struct kref ref;
u32 max_sg_cnt;
struct work_struct put_work;
};
struct nvmet_fc_port_entry {
@ -247,6 +249,13 @@ static int nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc);
static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue);
static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue);
static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport);
static void nvmet_fc_put_tgtport_work(struct work_struct *work)
{
struct nvmet_fc_tgtport *tgtport =
container_of(work, struct nvmet_fc_tgtport, put_work);
nvmet_fc_tgtport_put(tgtport);
}
static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport);
static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
struct nvmet_fc_fcp_iod *fod);
@ -358,7 +367,7 @@ __nvmet_fc_finish_ls_req(struct nvmet_fc_ls_req_op *lsop)
if (!lsop->req_queued) {
spin_unlock_irqrestore(&tgtport->lock, flags);
goto out_puttgtport;
goto out_putwork;
}
list_del(&lsop->lsreq_list);
@ -371,8 +380,8 @@ __nvmet_fc_finish_ls_req(struct nvmet_fc_ls_req_op *lsop)
(lsreq->rqstlen + lsreq->rsplen),
DMA_BIDIRECTIONAL);
out_puttgtport:
nvmet_fc_tgtport_put(tgtport);
out_putwork:
queue_work(nvmet_wq, &tgtport->put_work);
}
static int
@ -1396,6 +1405,7 @@ nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo,
kref_init(&newrec->ref);
ida_init(&newrec->assoc_cnt);
newrec->max_sg_cnt = template->max_sgl_segments;
INIT_WORK(&newrec->put_work, nvmet_fc_put_tgtport_work);
ret = nvmet_fc_alloc_ls_iodlist(newrec);
if (ret) {