On Mon, Aug 21, 2023 at 05:56:02PM +0800, chengming.zhou@linux.dev wrote:

From: Chengming Zhou <redacted>

Just like blk_mq_alloc_tag_set(), it's better to prepare all tags before
using to map to queue ctxs in blk_mq_map_swqueue(), which now have to
consider empty set->tags[].

The good point is that we can fallback easily if increasing nr_hw_queues
fail, instead of just mapping to hctx[0] when fail in blk_mq_map_swqueue().

And the fallback path already has tags free & clean handling, so all
is good.

Signed-off-by: Chengming Zhou <redacted>

Reviewed-by: Ming Lei <redacted>

-- 
Ming