[PATCH] nvme: revert the cross-controller atomic write size validation

[Keith Busch]

On Mon, Jul 14, 2025 at 04:44:01PM +0200, Christoph Hellwig wrote:
> This was originally added by commit 8695f060a029 ("nvme: all namespaces
> in a subsystem must adhere to a common atomic write size") to check
> the all controllers in a subsystem report the same atomic write size,
> but the check wasn't quite correct and caused problems for devices
> with multiple namespaces that report different LBA sizes.  Commit
> f46d273449ba ("nvme: fix atomic write size validation") tried to fix
> this, but then caused problems for namespace rediscovery after a
> format with an LBA size change that changes the AWUPF value.
> 
> This drop the validation and essentially revers those two commits while
> keeping the cleanup that went in between the two.  We'll need to figure
> out how to properly check for the mouse trap that nvme left us, but for
> now revert the check to keep devices working for users who couldn't care
> less about the atomic write feature.

Looks good.

Reviewed-by: Keith Busch <kbusch at kernel.org>