linux-kernel - Re: [PATCH v3 3/3] nvmet: preserve controller serial number between reboots

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Date:   Fri, 14 Jul 2017 14:56:12 +0200
From:   Christoph Hellwig <hch@....de>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH v3 3/3] nvmet: preserve controller serial number
        between reboots

> +	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@....de>