[PATCH 19/20] bcache: remove a superflous lookup_bdev all

[Christoph Hellwig]

On Wed, Nov 18, 2020 at 04:54:51PM +0800, Coly Li wrote:
> On 11/18/20 4:47 PM, Christoph Hellwig wrote:
> > Don't bother to call lookup_bdev for just a slightly different error
> > message without any functional change.
> > 
> > Signed-off-by: Christoph Hellwig <hch at lst.de>ist
> 
> Hi Christoph,
> 
> NACK. This removing error message is frequently triggered and observed,
> and distinct a busy device and an already registered device is important
> (the first one is critical error and second one is not).
> 
> Remove such error message will be a functional regression.

I can probably keep it, the amount of code to prettiefy an error message
seems excessive, though.