linux-kernel - Re: [PATCH 4.19 112/113] libnvdimm/bus: Stop holding nvdimm_bus_list_mutex over __nd

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Message-ID: <20190731181444.GA821@amd>
Date:   Wed, 31 Jul 2019 20:14:45 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Vishal Verma <vishal.l.verma@...el.com>,
        Jane Chu <jane.chu@...cle.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 4.19 112/113] libnvdimm/bus: Stop holding
 nvdimm_bus_list_mutex over __nd_ioctl()

On Mon 2019-07-29 21:23:19, Greg Kroah-Hartman wrote:
> From: Dan Williams <dan.j.williams@...el.com>
> 
> commit b70d31d054ee3a6fc1034b9d7fc0ae1e481aa018 upstream.
> 
> In preparation for fixing a deadlock between wait_for_bus_probe_idle()
> and the nvdimm_bus_list_mutex arrange for __nd_ioctl() without
> nvdimm_bus_list_mutex held. This also unifies the 'dimm' and 'bus' level
> ioctls into a common nd_ioctl() preamble implementation.

Ok, so this is a preparation patch, not a fix...

> Marked for -stable as it is a pre-requisite for a follow-on fix.

...but follow-on fixes are going to be applied for 5.2 but not
4.19. So perhaps this one should not be in 4.19, either?

Best regards,
								Pavel

(Plus its quite complex).
>  drivers/nvdimm/bus.c     |   94 ++++++++++++++++++++++++++++-------------------
>  drivers/nvdimm/nd-core.h |    3 +

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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