[PATCH 1/4] block: don't unconditionally set max_discard_sectors in blk_queue_max_discard_sectors

[Keith Busch]

On Fri, Jul 07, 2023 at 11:46:13AM +0200, Christoph Hellwig wrote:
>  {
>  	q->limits.max_hw_discard_sectors = max_discard_sectors;
> -	q->limits.max_discard_sectors = max_discard_sectors;
> +	if (!q->limits.max_discard_sectors ||
> +	     q->limits.max_discard_sectors > max_discard_sectors)
> +		q->limits.max_discard_sectors = max_discard_sectors;

Could simplify to min_not_zero().

But this only allows you to make the limit smaller. If the user never
set max_discard_sectors before, and a firmware update allows a larger
max_hw_discard_sectors, the subsequent rescan won't use the new limit.