linux-kernel - Re: [PATCH v2 01/46] mtdpart: Propagate _get/put

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Message-ID: <CACYmx9Oh6z84HggiWw+zou9Zy9cFerrm8Krpd-Y2Rk8oVDP1kg@mail.gmail.com>
Date:   Thu, 15 Dec 2016 07:09:10 +0000
From:   Karl Beldan <karl.beldan@...il.com>
To:     Brian Norris <computersforpeace@...il.com>
Cc:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Daniel Walter <dwalter@...ma-star.at>,
        Stable <stable@...r.kernel.org>
Subject: Re: [PATCH v2 01/46] mtdpart: Propagate _get/put_device()

On Wed, Dec 14, 2016 at 9:09 PM, Brian Norris
<computersforpeace@...il.com> wrote:
> On Wed, Dec 14, 2016 at 07:24:46PM +0000, Karl Beldan wrote:
>> On Wed, Sep 28, 2016 at 8:16 PM, Brian Norris
>> <computersforpeace@...il.com> wrote:
>> > On Wed, Sep 21, 2016 at 12:15:31PM +0200, Boris Brezillon wrote:
>> >> On Wed, 21 Sep 2016 11:43:56 +0200
>> >> Daniel Walter <dwalter@...ma-star.at> wrote:
>> >>
>> >> > From: Richard Weinberger <richard@....at>
>> >> >
>> >> > If the master device has callbacks for _get/put_device()
>> >> > and this MTD has slaves a get_mtd_device() call on paritions
>> >> > will never issue the registered callbacks.
>> >> > Fix this by propagating _get/put_device() down.
>> >>
>> >> Brian, can we have this one queued for 4.9? I can't take it in my tree
>> >> if you want, but it's probably better if it's in the mtd tree.
>> >
>> > Applied this patch to l2-mtd.git
>> >
>>
>> I think this should also go into -stable.
>
> Why? Do you have real use cases that are broken by this? I understand

I do, some code adding partitions on a gluebi master.

> this is a problem, but I'm curious on how this satisfies the stable
> rules.
>
> Also, note that this isn't a regression; it's been broken forever and
> apparently no one noticed. IMO that raises the bar a bit (but not
> impossibly so) for -stable.
>

I just encountered the bug yesterday and yes it is obvious it has been
broken forever.
I don't have strong opinion about these things so no worries.

Karl

> Anyway, if we decide to do this, you'll also want to include the git
> hash and applicable kernel versions, per Option 2 [1].
>
> Brian
>
> [1] Documentation/stable_kernel_rules.txt.