diff --git a/fs/io_uring.c b/fs/io_uring.c index 104dff9c7131..b258ba20571d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1009,6 +1009,18 @@ static inline bool __io_match_files(struct io_kiocb *req, req->work.identity->files == files; } +static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) +{ + bool got = percpu_ref_tryget(ref); + + /* already at zero, wait for ->release() */ + if (!got) + wait_for_completion(compl); + percpu_ref_resurrect(ref); + if (got) + percpu_ref_put(ref); +} + static bool io_match_task(struct io_kiocb *head, struct task_struct *task, struct files_struct *files) @@ -9756,12 +9768,11 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, if (ret < 0) break; } while (1); - mutex_lock(&ctx->uring_lock); if (ret) { - percpu_ref_resurrect(&ctx->refs); - goto out_quiesce; + io_refs_resurrect(&ctx->refs, &ctx->ref_comp); + return ret; } } @@ -9854,7 +9865,6 @@ out: if (io_register_op_must_quiesce(opcode)) { /* bring the ctx back to life */ percpu_ref_reinit(&ctx->refs); -out_quiesce: reinit_completion(&ctx->ref_comp); } return ret;