[PATCH 7/9] nvme-apple: Serialize command issue

[Christoph Hellwig]

On Mon, Mar 21, 2022 at 05:50:47PM +0100, Sven Peter wrote:
> From: Jens Axboe <axboe at kernel.dk>
> 
> This controller shouldn't need serialization of command issue since
> the SQ is replaced by a simple array and commands are issued by writing
> the array index to a MMIO register.
> Without serialization however sometimes commands are still executed
> correctly and appear in the CQ but never trigger an interrupt.
> 
> Signed-off-by: Jens Axboe <axboe at kernel.dk>
> [sven: added our best guess why this needs to be done]
> Signed-off-by: Sven Peter <sven at svenpeter.dev>

This really should go into the previous patch.