From 5636c00d3e8ef1f6d1291e71edb48f727ba5a999 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Wed, 18 Aug 2021 12:42:45 +0100
Subject: [PATCH] io_uring: flush completions for fallbacks
Git-commit: 5636c00d3e8ef1f6d1291e71edb48f727ba5a999
Patch-mainline: v5.15-rc1
References: bsc#1205205

io_fallback_req_func() doesn't expect anyone creating inline
completions, and no one currently does that. Teach the function to flush
completions preparing for further changes.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8b941516921f72e1a64d58932d671736892d7fff.1629286357.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
 fs/io_uring.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3898f7ab14f6..926df5b00b31 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1197,6 +1197,11 @@ static void io_fallback_req_func(struct work_struct *work)
 	percpu_ref_get(&ctx->refs);
 	llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node)
 		req->io_task_work.func(req);
+
+	mutex_lock(&ctx->uring_lock);
+	if (ctx->submit_state.compl_nr)
+		io_submit_flush_completions(ctx);
+	mutex_unlock(&ctx->uring_lock);
 	percpu_ref_put(&ctx->refs);
 }
 
-- 
2.35.3