[PATCH v2 12/13] block: make __register_blkdev() return an error

[Christoph Hellwig]

On Wed, Nov 03, 2021 at 05:21:56AM -0700, Luis Chamberlain wrote:
> This makes __register_blkdev() return an error, and also changes the
> probe() call to return an error as well.
> 
> We expand documentation for the probe call to ensure that if the block
> device already exists we don't return on error on that condition. We do
> this as otherwise we loose ability to handle concurrent requests if the
> block device already existed.

I'm still not really sold on this - if the probe fails no bdev will
be registered and the lookup will fail.  What is the benefit of
propagating the exact error here?