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authorPavel Begunkov <asml.silence@gmail.com>2020-04-06 00:08:52 +0300
committerJens Axboe <axboe@kernel.dk>2020-04-06 01:23:48 +0300
commit48bdd849e967f1c573d2b2bc24308e24a83f39c2 (patch)
treee29af07d9384af6fda345ac51290cab9ad995766 /fs/io_uring.c
parent581f981034890dfd27be7e98946e8f0461f3967a (diff)
downloadlinux-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.c1
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;
}