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io_uring: honour zeroes as io-wq worker limits 

When we pass in zero as an io-wq worker number limit it shouldn't
actually change the limits but return the old value, follow that
behaviour with deferred limits setup as well.

Cc: stable@kernel.org # 5.15
Reported-by: Beld Zhang <beldzhang@gmail.com>
Fixes: e139a1ec92 ("io_uring: apply max_workers limit to all future users")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1b222a92f7a78a24b042763805e891a4cdd4b544.1636384034.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-11-08 15:10:03 +00:00 committed by Jens Axboe
parent a19577808f
commit bad119b9a0
1 changed files with 3 additions and 1 deletions
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4
fs/io_uring.c
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@ -10791,7 +10791,9 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits));
memcpy(ctx->iowq_limits, new_count, sizeof(new_count));
for (i = 0; i < ARRAY_SIZE(new_count); i++)
if (new_count[i])
ctx->iowq_limits[i] = new_count[i];
ctx->iowq_limits_set = true;
if (tctx && tctx->io_wq) {