[PATCHv3] nvme: find numa distance only if controller has valid numa id

[Chaitanya Kulkarni]

On 4/16/2024 1:19 AM, Nilay Shroff wrote:
> On system where native nvme multipath is configured and iopolicy
> is set to numa but the nvme controller numa node id is undefined
> or -1 (NUMA_NO_NODE) then avoid calculating node distance for
> finding optimal io path. In such case we may access numa distance
> table with invalid index and that may potentially refer to incorrect
> memory. So this patch ensures that if the nvme controller numa node
> id is -1 then instead of calculating node distance for finding optimal
> io path, we set the numa node distance of such controller to default 10
> (LOCAL_DISTANCE).
> 
> Link:https://lore.kernel.org/all/20240413090614.678353-1-nilay@linux.ibm.com/
> Signed-off-by: Nilay Shroff<nilay at linux.ibm.com>

Reviewed-by: Chaitanya Kulkarni <kch at nvidia.com>

-ck