From bad119b9a00019054f0c9e2045f312ed63ace4f4 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Mon, 8 Nov 2021 15:10:03 +0000 Subject: 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 Fixes: e139a1ec92f8d ("io_uring: apply max_workers limit to all future users") Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/1b222a92f7a78a24b042763805e891a4cdd4b544.1636384034.git.asml.silence@gmail.com Signed-off-by: Jens Axboe --- fs/io_uring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/io_uring.c b/fs/io_uring.c index ac1bc8ac4666..b07196b4511c 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -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) { -- cgit v1.2.3-70-g09d2