[PATCH 12/13] vfio/gvt: Fix open/close when multiple device FDs are open

[Zhenyu Wang]

On 2021.07.14 21:20:41 -0300, Jason Gunthorpe wrote:
> The user can open multiple device FDs if it likes, however the open
> function calls vfio_register_notifier() on device global state. Calling
> vfio_register_notifier() twice will trigger a WARN_ON from
> notifier_chain_register() and the first close will wrongly delete the
> notifier and more.
> 
> Since these really want the new open/close_device() semantics just change
> the function over.
> 
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
> ---
>  drivers/gpu/drm/i915/gvt/kvmgt.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index 1ac98f8aba31e6..7efa386449d104 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -885,7 +885,7 @@ static int intel_vgpu_group_notifier(struct notifier_block *nb,
>  	return NOTIFY_OK;
>  }
>  
> -static int intel_vgpu_open(struct mdev_device *mdev)
> +static int intel_vgpu_open_device(struct mdev_device *mdev)
>  {
>  	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
>  	struct kvmgt_vdev *vdev = kvmgt_vdev(vgpu);
> @@ -1004,7 +1004,7 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
>  	vgpu->handle = 0;
>  }
>  
> -static void intel_vgpu_release(struct mdev_device *mdev)
> +static void intel_vgpu_close_device(struct mdev_device *mdev)
>  {
>  	struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
>  
> @@ -1753,8 +1753,8 @@ static struct mdev_parent_ops intel_vgpu_ops = {
>  	.create			= intel_vgpu_create,
>  	.remove			= intel_vgpu_remove,
>  
> -	.open			= intel_vgpu_open,
> -	.release		= intel_vgpu_release,
> +	.open_device		= intel_vgpu_open_device,
> +	.close_device		= intel_vgpu_close_device,
>  
>  	.read			= intel_vgpu_read,
>  	.write			= intel_vgpu_write,

Looks ok to me. Thanks!

Reviewed-by: Zhenyu Wang <zhenyuw at linux.intel.com>
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