linux-kernel - Re: [PATCH 33/34] vfio/mdev: Use the driver core to create the 'remove' file

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Message-ID: <c66642f9-2e8f-8c0c-d9d0-91489fe1413d@nvidia.com>
Date:   Wed, 13 Apr 2022 02:22:21 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     Christoph Hellwig <hch@....de>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>
Cc:     Jason Gunthorpe <jgg@...dia.com>, intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 33/34] vfio/mdev: Use the driver core to create the
 'remove' file



On 4/11/2022 7:44 PM, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@...dia.com>
> 
> The device creator is supposed to use the dev.groups value to add sysfs
> files before device_add is called, not call sysfs_create_files() after
> device_add() returns. This creates a race with uevent delivery where the
> extra attribute will not be visible.
> 
> This was being done because the groups had been co-opted by the mdev
> driver, now that prior patches have moved the driver's groups to the
> struct device_driver the dev.group is properly free for use here.
> 
> Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   drivers/vfio/mdev/mdev_core.c    |  1 +
>   drivers/vfio/mdev/mdev_private.h |  2 ++
>   drivers/vfio/mdev/mdev_sysfs.c   | 19 ++++++++++---------
>   3 files changed, 13 insertions(+), 9 deletions(-)
> 

Reviewed-by: Kirti Wankhede <kwankhede@...dia.com>