linux-kernel - Re: [PATCH v4 2/2] vfio/mdev: Re-order sysfs attribute creation

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Message-ID: <30699b42-a587-7235-5fec-e745cd5c925d@nvidia.com>
Date:   Sat, 19 May 2018 01:08:07 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <cohuck@...hat.com>, <pasic@...ux.ibm.com>
Subject: Re: [PATCH v4 2/2] vfio/mdev: Re-order sysfs attribute creation



On 5/19/2018 12:40 AM, Alex Williamson wrote:
> There exists a gap at the end of mdev_device_create() where the device
> is visible to userspace, but we're not yet ready to handle removal, as
> triggered through the 'remove' attribute.  We handle this properly in
> mdev_device_remove() with an -EAGAIN return, but we can marginally
> reduce this gap by adding this attribute as a final step of our sysfs
> setup.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

Looks good.

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

> ---
>  drivers/vfio/mdev/mdev_sysfs.c |   14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
> index 802df210929b..249472f05509 100644
> --- a/drivers/vfio/mdev/mdev_sysfs.c
> +++ b/drivers/vfio/mdev/mdev_sysfs.c
> @@ -257,24 +257,24 @@ int  mdev_create_sysfs_files(struct device *dev, struct mdev_type *type)
>  {
>  	int ret;
>  
> -	ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
> -	if (ret)
> -		return ret;
> -
>  	ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev));
>  	if (ret)
> -		goto device_link_failed;
> +		return ret;
>  
>  	ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
>  	if (ret)
>  		goto type_link_failed;
>  
> +	ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
> +	if (ret)
> +		goto create_files_failed;
> +
>  	return ret;
>  
> +create_files_failed:
> +	sysfs_remove_link(&dev->kobj, "mdev_type");
>  type_link_failed:
>  	sysfs_remove_link(type->devices_kobj, dev_name(dev));
> -device_link_failed:
> -	sysfs_remove_files(&dev->kobj, mdev_device_attrs);
>  	return ret;
>  }
>  
>