From 5905535610fc6b11379a999ff45bfa39f0d605b6 Mon Sep 17 00:00:00 2001
From: Sam Bradshaw <sbradshaw@micron.com>
Date: Tue, 29 Jul 2014 13:31:36 -0700
Subject: [PATCH] NVMe: Correctly handle IOCTL_SUBMIT_IO when cpus > online
 queues

nvme_submit_io_cmd() uses smp_processor_id() to pick an IO queue index.
This patch fixes the case where there are more cpus from which the ioctl
call can originate than online queues, which can happen when a device
supports or was allocated fewer interrupt vectors than exist cpu cores.

Thanks to Keith Busch for the implementation suggestion.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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