On Fri, Oct 22, 2021 at 02:47:47PM +0800, Mark-PK Tsai wrote:

dm_early_create() fail if the target block device not found in
the late init stage.
The block device is created in mmc_rescan() which kernel do
it async by queue it into system_freezable_wq.
Add module param bdev_wait to support waiting the block device
ready before dm_early_create() like prepare_namespace() does.

This adds a busy loop.  There is a reason why we usually set up
stacking drivers from userspace, in that we have a working event
system there.  So the answer is not to add further hacks to the
in-kernel DM setup hack, but to stop using it.

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