linux-kernel - Re: [PATCH v2] vfio: platform: ignore missing reset if disabled at module init

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Date:   Wed, 1 Feb 2023 12:47:42 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Tomasz Duszynski <tduszynski@...vell.com>
Cc:     Eric Auger <eric.auger@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "open list:VFIO PLATFORM DRIVER" <kvm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, <jerinj@...vell.com>
Subject: Re: [PATCH v2] vfio: platform: ignore missing reset if disabled at
 module init

On Tue, 31 Jan 2023 09:33:49 +0100
Tomasz Duszynski <tduszynski@...vell.com> wrote:

> If reset requirement was relaxed via module parameter errors caused by
> missing reset should not be propagated down to the vfio core.
> Otherwise initialization will fail.
> 
> Signed-off-by: Tomasz Duszynski <tduszynski@...vell.com>
> Fixes: 5f6c7e0831a1 ("vfio/platform: Use the new device life cycle helpers")
> ---
> v2:
> - return directly instead of using ternary to do that
> 
>  drivers/vfio/platform/vfio_platform_common.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
> index 1a0a238ffa35..7325ff463cf0 100644
> --- a/drivers/vfio/platform/vfio_platform_common.c
> +++ b/drivers/vfio/platform/vfio_platform_common.c
> @@ -650,10 +650,13 @@ int vfio_platform_init_common(struct vfio_platform_device *vdev)
>  	mutex_init(&vdev->igate);
> 
>  	ret = vfio_platform_get_reset(vdev);
> -	if (ret && vdev->reset_required)
> +	if (ret && vdev->reset_required) {
>  		dev_err(dev, "No reset function found for device %s\n",
>  			vdev->name);
> -	return ret;
> +		return ret;
> +	}
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL_GPL(vfio_platform_init_common);

Applied to vfio next branch for v6.3.  Thanks,

Alex