linux-kernel - Re: [PATCH 0/2] mtd: prepare for dynamically removed devices

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Date:   Thu, 22 Jun 2023 10:30:32 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Alexander Usyskin <alexander.usyskin@...el.com>
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tomas Winkler <tomas.winkler@...el.com>,
        Vitaly Lubart <vitaly.lubart@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 0/2] mtd: prepare for dynamically removed devices

Hi Alexander,

alexander.usyskin@...el.com wrote on Tue, 20 Jun 2023 16:19:03 +0300:

> Prepare mtd subsystem for devices that can be dynamically removed,
> like memory on PCIE card.
> Use refcount to prevent crashes when underlying device
> removed unexpectedly and reshuffle __get and __put functions
> to allow underlying device to clean it memory according to refcount.
> 
> Alexander Usyskin (1):
>   mtd: call external _get and _put in right order
> 
> Tomas Winkler (1):
>   mtd: use refcount to prevent corruption
> 
>  drivers/mtd/mtdcore.c   | 86 ++++++++++++++++++++++-------------------
>  drivers/mtd/mtdcore.h   |  1 +
>  drivers/mtd/mtdpart.c   | 14 ++++---
>  include/linux/mtd/mtd.h |  2 +-
>  4 files changed, 56 insertions(+), 47 deletions(-)
> 

The idea is of course great, the implementation looks fine, but the
risk is too high at -rc7 so I'll take this at -rc1 for the next
release.

Thanks, Miquèl