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| author | Pavel Begunkov <asml.silence@gmail.com> | 2023-03-30 06:52:38 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-04-06 12:10:52 +0200 |
| commit | d67b3cdacac911958c6353f043fe98d42c84f5ad (patch) | |
| tree | bd7b4b1dff698b1f2bdb265b616475a1109f3db2 /io_uring | |
| parent | ef329fa764c3c27f43db0f7c57adbe84e9a07f00 (diff) | |
| download | linux-d67b3cdacac911958c6353f043fe98d42c84f5ad.tar.gz | |
io_uring: fix poll/netmsg alloc caches
commit fd30d1cdcc4ff405fc54765edf2e11b03f2ed4f3 upstream.
We increase cache->nr_cached when we free into the cache but don't
decrease when we take from it, so in some time we'll get an empty
cache with cache->nr_cached larger than IO_ALLOC_CACHE_MAX, that fails
io_alloc_cache_put() and effectively disables caching.
Fixes: 9b797a37c4bd8 ("io_uring: add abstraction around apoll cache")
Cc: stable@vger.kernel.org
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/alloc_cache.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h index 729793ae9712..c2cde88aeed5 100644 --- a/io_uring/alloc_cache.h +++ b/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); } |