io_uring/notif: simplify io_notif_flush()

io_notif_flush() is partially duplicating io_tx_ubuf_complete(), so
instead of duplicating it, make the flush call io_tx_ubuf_complete.

Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/19e41652c16718b946a5c80d2ad409df7682e47e.1713369317.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/notif.c

@@ -9,7 +9,7 @@
 #include "notif.h"
 #include "rsrc.h"
 
-void io_notif_tw_complete(struct io_kiocb *notif, struct io_tw_state *ts)
+static void io_notif_tw_complete(struct io_kiocb *notif, struct io_tw_state *ts)
 {
 	struct io_notif_data *nd = io_notif_to_data(notif);
 
@@ -23,8 +23,8 @@ void io_notif_tw_complete(struct io_kiocb *notif, struct io_tw_state *ts)
 	io_req_task_complete(notif, ts);
 }
 
-static void io_tx_ubuf_complete(struct sk_buff *skb, struct ubuf_info *uarg,
-				bool success)
+void io_tx_ubuf_complete(struct sk_buff *skb, struct ubuf_info *uarg,
+			 bool success)
 {
 	struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
 	struct io_kiocb *notif = cmd_to_io_kiocb(nd);

io_uring/notif.h

@@ -21,7 +21,8 @@ struct io_notif_data {
 };
 
 struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx);
-void io_notif_tw_complete(struct io_kiocb *notif, struct io_tw_state *ts);
+void io_tx_ubuf_complete(struct sk_buff *skb, struct ubuf_info *uarg,
+			 bool success);
 
 static inline struct io_notif_data *io_notif_to_data(struct io_kiocb *notif)
 {
@@ -33,11 +34,7 @@ static inline void io_notif_flush(struct io_kiocb *notif)
 {
 	struct io_notif_data *nd = io_notif_to_data(notif);
 
-	/* drop slot's master ref */
-	if (refcount_dec_and_test(&nd->uarg.refcnt)) {
-		notif->io_task_work.func = io_notif_tw_complete;
-		__io_req_task_work_add(notif, IOU_F_TWQ_LAZY_WAKE);
-	}
+	io_tx_ubuf_complete(NULL, &nd->uarg, true);
 }
 
 static inline int io_notif_account_mem(struct io_kiocb *notif, unsigned len)