io_uring: move kbuf put out of generic tw complete

There are multiple users of io_req_task_complete() including zc
notifications, but only read requests use selected buffers. As we
already have an rw specific tw function, move io_put_kbuf() in there.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/94374c7649aaefc3a17808dc4701f25ccd457e25.1667557923.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -1476,12 +1476,6 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
 
 void io_req_task_complete(struct io_kiocb *req, bool *locked)
 {
-	if (req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)) {
-		unsigned issue_flags = *locked ? 0 : IO_URING_F_UNLOCKED;
-
-		req->cqe.flags |= io_put_kbuf(req, issue_flags);
-	}
-
 	if (*locked)
 		io_req_complete_defer(req);
 	else

io_uring/rw.c

@@ -286,6 +286,12 @@ static inline int io_fixup_rw_res(struct io_kiocb *req, long res)
 static void io_req_rw_complete(struct io_kiocb *req, bool *locked)
 {
 	io_req_io_end(req);
+
+	if (req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)) {
+		unsigned issue_flags = *locked ? 0 : IO_URING_F_UNLOCKED;
+
+		req->cqe.flags |= io_put_kbuf(req, issue_flags);
+	}
 	io_req_task_complete(req, locked);
 }