return cmpxchg(&head->first, old, new);
}
-static __cold void io_fallback_tw(struct io_uring_task *tctx)
+static __cold void io_fallback_tw(struct io_uring_task *tctx, bool sync)
{
struct llist_node *node = llist_del_all(&tctx->task_list);
+ struct io_ring_ctx *last_ctx = NULL;
struct io_kiocb *req;
while (node) {
req = container_of(node, struct io_kiocb, io_task_work.node);
node = node->next;
+ if (sync && last_ctx != req->ctx) {
+ if (last_ctx) {
+ flush_delayed_work(&last_ctx->fallback_work);
+ percpu_ref_put(&last_ctx->refs);
+ }
+ last_ctx = req->ctx;
+ percpu_ref_get(&last_ctx->refs);
+ }
if (llist_add(&req->io_task_work.node,
&req->ctx->fallback_llist))
schedule_delayed_work(&req->ctx->fallback_work, 1);
}
+
+ if (last_ctx) {
+ flush_delayed_work(&last_ctx->fallback_work);
+ percpu_ref_put(&last_ctx->refs);
+ }
}
void tctx_task_work(struct callback_head *cb)
unsigned int count = 0;
if (unlikely(current->flags & PF_EXITING)) {
- io_fallback_tw(tctx);
+ io_fallback_tw(tctx, true);
return;
}
if (likely(!task_work_add(req->task, &tctx->task_work, ctx->notify_method)))
return;
- io_fallback_tw(tctx);
+ io_fallback_tw(tctx, false);
}
void __io_req_task_work_add(struct io_kiocb *req, unsigned flags)
if (ctx->rings)
io_kill_timeouts(ctx, NULL, true);
+ flush_delayed_work(&ctx->fallback_work);
+
INIT_WORK(&ctx->exit_work, io_ring_exit_work);
/*
* Use system_unbound_wq to avoid spawning tons of event kworkers