[PATCH] io-mapping: Indicate mapping failure

[Andy Shevchenko]

On Tue, Jul 21, 2020 at 10:16:41AM -0400, Michael J. Ruhl wrote:
> Sometimes it is good to know when your mapping failed.

Can you elaborate...

> Fixes: cafaf14a5d8f ("io-mapping: Always create a struct to hold metadata about the io-mapping"

...especially taking into account that Fixes implies regression / bug?

-- 
With Best Regards,
Andy Shevchenko