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authorJens Axboe <axboe@kernel.dk>2021-02-23 19:17:35 -0700
committerJens Axboe <axboe@kernel.dk>2021-02-23 19:18:13 -0700
commit7c977a58dc83366e488c217fd88b1469d242bee5 (patch)
tree54174fc5f340870547021faa82a4f89df9a803da
parent8e5c66c485a8af3f39a8b0358e9e09f002016d92 (diff)
io_uring: don't attempt IO reissue from the ring exit path
If we're exiting the ring, just let the IO fail with -EAGAIN as nobody will care anyway. It's not the right context to reissue from. Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--fs/io_uring.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index bf9ad810c621..275ad84e8227 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2839,6 +2839,13 @@ static bool io_rw_reissue(struct io_kiocb *req)
return false;
if ((req->flags & REQ_F_NOWAIT) || io_wq_current_is_worker())
return false;
+ /*
+ * If ref is dying, we might be running poll reap from the exit work.
+ * Don't attempt to reissue from that path, just let it fail with
+ * -EAGAIN.
+ */
+ if (percpu_ref_is_dying(&req->ctx->refs))
+ return false;
lockdep_assert_held(&req->ctx->uring_lock);