linux-kernel - Re: [PATCH v1] drivers/base/memory: add memory block to memory group after registration succeeded

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Message-ID: <Yfd5Kz1HggmhIOC9@localhost.localdomain>
Date:   Mon, 31 Jan 2022 06:52:43 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v1] drivers/base/memory: add memory block to memory group
 after registration succeeded

On Fri, Jan 28, 2022 at 03:45:40PM +0100, David Hildenbrand wrote:
> If register_memory() fails, we freed the memory block but already added
> the memory block to the group list, not good. Let's defer adding the
> block to the memory group to after registering the memory block device.
> 
> We do handle it properly during unregister_memory(), but that's not
> called when the registration fails.
> 
> Fixes: 028fc57a1c36 ("drivers/base/memory: introduce "memory groups" to logically group memory blocks")
> Cc: stable@...r.kernel.org # v5.15+
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>


-- 
Oscar Salvador
SUSE Labs