Merge tag 'io_uring-6.3-2023-03-30' of git://git.kernel.dk/linux

Pull io_uring fixes from Jens Axboe:

 - Fix a regression with the poll retry, introduced in this merge window
   (me)

 - Fix a regression with the alloc cache not decrementing the member
   count on removal. Also a regression from this merge window (Pavel)

 - Fix race around rsrc node grabbing (Pavel)

* tag 'io_uring-6.3-2023-03-30' of git://git.kernel.dk/linux:
  io_uring: fix poll/netmsg alloc caches
  io_uring/rsrc: fix rogue rsrc node grabbing
  io_uring/poll: clear single/double poll flags on poll arming

Author: torvalds

io_uring/alloc_cache.h

@@ -27,6 +27,7 @@ static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *c
 		struct hlist_node *node = cache->list.first;
 
 		hlist_del(node);
+		cache->nr_cached--;
 		return container_of(node, struct io_cache_entry, node);
 	}
 

io_uring/poll.c

@@ -726,6 +726,7 @@ int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags)
 	apoll = io_req_alloc_apoll(req, issue_flags);
 	if (!apoll)
 		return IO_APOLL_ABORTED;
+	req->flags &= ~(REQ_F_SINGLE_POLL | REQ_F_DOUBLE_POLL);
 	req->flags |= REQ_F_POLLED;
 	ipt.pt._qproc = io_async_queue_proc;
 

io_uring/rsrc.h

@@ -144,15 +144,13 @@ static inline void io_req_set_rsrc_node(struct io_kiocb *req,
 					unsigned int issue_flags)
 {
 	if (!req->rsrc_node) {
-		req->rsrc_node = ctx->rsrc_node;
+		io_ring_submit_lock(ctx, issue_flags);
 
-		if (!(issue_flags & IO_URING_F_UNLOCKED)) {
-			lockdep_assert_held(&ctx->uring_lock);
+		lockdep_assert_held(&ctx->uring_lock);
 
-			io_charge_rsrc_node(ctx);
-		} else {
-			percpu_ref_get(&req->rsrc_node->refs);
-		}
+		req->rsrc_node = ctx->rsrc_node;
+		io_charge_rsrc_node(ctx);
+		io_ring_submit_unlock(ctx, issue_flags);
 	}
 }