Re: [PATCH] vfio/pci: Hold igate across releasing eventfd contexts

[Cornelia Huck]

On Mon, 20 Jul 2020 15:09:27 -0600
Alex Williamson <alex.williamson@xxxxxxxxxx> wrote:

> No need to release and immediately re-acquire igate while clearing
> out the eventfd ctxs.
> 
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> ---
>  drivers/vfio/pci/vfio_pci.c |    4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index b0258b79bb5b..dabca0450e6d 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -523,14 +523,12 @@ static void vfio_pci_release(void *device_data)
>  		vfio_pci_vf_token_user_add(vdev, -1);
>  		vfio_spapr_pci_eeh_release(vdev->pdev);
>  		vfio_pci_disable(vdev);
> +
>  		mutex_lock(&vdev->igate);
>  		if (vdev->err_trigger) {
>  			eventfd_ctx_put(vdev->err_trigger);
>  			vdev->err_trigger = NULL;
>  		}
> -		mutex_unlock(&vdev->igate);
> -
> -		mutex_lock(&vdev->igate);
>  		if (vdev->req_trigger) {
>  			eventfd_ctx_put(vdev->req_trigger);
>  			vdev->req_trigger = NULL;
> 

Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>