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| author | Pavel Begunkov <asml.silence@gmail.com> | 2020-04-06 00:08:52 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-04-06 01:23:48 +0300 |
| commit | 48bdd849e967f1c573d2b2bc24308e24a83f39c2 (patch) | |
| tree | e29af07d9384af6fda345ac51290cab9ad995766 /fs/io_uring.c | |
| parent | 581f981034890dfd27be7e98946e8f0461f3967a (diff) | |
| download | linux-48bdd849e967f1c573d2b2bc24308e24a83f39c2.tar.xz | |
io_uring: fix ctx refcounting in io_submit_sqes()
If io_get_req() fails, it drops a ref. Then, awhile keeping @submitted
unmodified, io_submit_sqes() breaks the loop and puts @nr - @submitted
refs. For each submitted req a ref is dropped in io_put_req() and
friends. So, for @nr taken refs there will be
(@nr - @submitted + @submitted + 1) dropped.
Remove ctx refcounting from io_get_req(), that at the same time makes
it clearer.
Fixes: 2b85edfc0c90 ("io_uring: batch getting pcpu references")
Cc: stable@vger.kernel.org # v5.6
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 78ae8e8ed5bf..79bd22289d73 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1342,7 +1342,6 @@ fallback: req = io_get_fallback_req(ctx); if (req) goto got_it; - percpu_ref_put(&ctx->refs); return NULL; } |