From 0c6e1d7fd5e7560fdc4bb3418c2c0f0d7a95bf76 Mon Sep 17 00:00:00 2001
From: Hao Xu <haoxu@linux.alibaba.com>
Date: Thu, 26 Aug 2021 01:58:56 +0800
Subject: [PATCH] io_uring: don't free request to slab
Git-commit: 0c6e1d7fd5e7560fdc4bb3418c2c0f0d7a95bf76
Patch-mainline: v5.15-rc1
References: bsc#1205205

It's not necessary to free the request back to slab when we fail to
get sqe, just move it to state->free_list.

Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/20210825175856.194299-1-haoxu@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e321cb0d00c4..be3c3aea6398 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6889,7 +6889,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
 		}
 		sqe = io_get_sqe(ctx);
 		if (unlikely(!sqe)) {
-			kmem_cache_free(req_cachep, req);
+			list_add(&req->inflight_entry, &ctx->submit_state.free_list);
 			break;
 		}
 		/* will complete beyond this point, count as submitted */
-- 
2.35.3