From: Pavel Begunkov asml.silence@gmail.com
commit bad119b9a00019054f0c9e2045f312ed63ace4f4 upstream.
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: e139a1ec92f8d ("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/1b222a92f7a78a24b042763805e891a4cdd4b544.163638403... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/io_uring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -10684,7 +10684,9 @@ static int io_register_iowq_max_workers(
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;
ret = -EINVAL;