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Date: Fri, 14 Jul 2017 14:56:12 +0200
From: Christoph Hellwig <hch@lst.de>
To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
        Keith Busch <keith.busch@intel.com>,
        Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
        Linux NVMe Mailinglist <linux-nvme@lists.infradead.org>
Subject: Re: [PATCH v3 3/3] nvmet: preserve controller serial number
        between reboots
Message-ID: <20170714125612.GC27181@lst.de>
References: <20170714125329.18430-1-jthumshirn@suse.de> <20170714125329.18430-4-jthumshirn@suse.de>
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> +	down_write(&nvmet_config_sem);
>  	subsys->ver = NVME_VS(1, 3, 0); /* NVMe 1.3.0 */
>  	/* generate a random serial number as our controllers are ephemeral: */
>  	get_random_bytes(&subsys->serial, sizeof(subsys->serial));
> +	up_write(&nvmet_config_sem);

no need for the lock here, the subsystems isn't visible at this point.

Otherwise:

Reviewed-by: Christoph Hellwig <hch@lst.de>