linux-kernel - Re: [PATCH v2] nvme: Add hardware monitoring support

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Message-ID: <20191031175425.GA25602@roeck-us.net>
Date:   Thu, 31 Oct 2019 10:54:25 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Akinobu Mita <akinobu.mita@...il.com>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org,
        Linux PM <linux-pm@...r.kernel.org>,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v2] nvme: Add hardware monitoring support

On Thu, Oct 31, 2019 at 02:45:49PM +0100, Christoph Hellwig wrote:
> On Wed, Oct 30, 2019 at 07:20:37PM -0700, Guenter Roeck wrote:
> >> The nvme_init_identify() can be called multiple time in nvme ctrl's
> >> lifetime (e.g 'nvme reset /dev/nvme*' or suspend/resume paths), so
> >> should we need to prevent nvme_hwmon_init() from registering hwmon
> >> device more than twice?
> >>
> >> In the nvme thermal zone patchset[1], thernal zone is registered in
> >> nvme_init_identify and unregistered in nvme_stop_ctrl().
> >>
> >
> > Doesn't that mean that the initialization should happen in nvme_start_ctrl()
> > and not here ?
> 
> I think calling it from nvme_init_identify is fine, it just needs to
> be in the "if (!ctrl->identified)" section of that function.

Excellent, I'll do that. Thanks a lot for the hint!

Guenter