linux-kernel - Re: [PATCH 31/34] vfio/mdev: Remove mdev_parent_ops dev_attr

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Date:   Wed, 13 Apr 2022 02:21:47 +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 31/34] vfio/mdev: Remove mdev_parent_ops dev_attr_groups



On 4/11/2022 7:44 PM, Christoph Hellwig wrote:
> From: Jason Gunthorpe <jgg@...dia.com>
> 
> This is only used by one sample to print a fixed string that is pointless.
> 
> In general, having a device driver attach sysfs attributes to the parent
> is horrific. This should never happen, and always leads to some kind of
> liftime bug as it become very difficult for the sysfs attribute to go back
> to any data owned by the device driver.
> 
> Remove the general mechanism to create this abuse.
> 
> Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   drivers/vfio/mdev/mdev_sysfs.c | 12 ++----------
>   include/linux/mdev.h           |  2 --
>   samples/vfio-mdev/mtty.c       | 30 +-----------------------------
>   3 files changed, 3 insertions(+), 41 deletions(-)
> 

Update Documentation/driver-api/vfio-mediated-device.rst where mtty 
sample code explained. Tree command output should be updated, i.e remove 
below 2 lines.
         |-- mtty_dev
         |   `-- sample_mtty_dev

Rest looks good to me.

Thanks,
Kirti