Re: [PATCH v3] block: Remove queue freezing from several sysfs store callbacks

On Thu, Oct 30, 2025 at 10:24:17AM -0700, Bart Van Assche wrote:

Freezing the request queue from inside sysfs store callbacks may cause a deadlock in combination with the dm-multipath driver and the queue_if_no_path option. Additionally, freezing the request queue slows down system boot on systems where sysfs attributes are set synchronously.

Fix this by removing the blk_mq_freeze_queue() / blk_mq_unfreeze_queue() calls from the store callbacks that do not strictly need these callbacks. This patch may cause a small delay in applying the new settings.

You'll also need data_race or READ_ONCE annotations to satisfy the memory model.