linux-kernel - Re: [PATCH V7 8/9] vfio: platform: check reset call return code during open

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Message-ID: <f1bc1f2f-d8cb-4879-a716-f67854e47b3b@redhat.com>
Date:	Wed, 15 Jun 2016 22:08:19 +0200
From:	Auger Eric <eric.auger@...hat.com>
To:	Sinan Kaya <okaya@...eaurora.org>, kvm@...r.kernel.org,
	timur@...eaurora.org, cov@...eaurora.org, jcm@...hat.com,
	alex.williamson@...hat.com, eric.auger@...aro.org
Cc:	linux-acpi@...r.kernel.org, agross@...eaurora.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Baptiste Reynal <b.reynal@...tualopensystems.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 8/9] vfio: platform: check reset call return code
 during open

Hi Sinan,

On 13/06/2016 06:26, Sinan Kaya wrote:
> Open call is ignoring the return code from reset call and can
> potentially continue even though reset call failed.
> 
> If reset_required module parameter is set, this patch is going
> to validate the return code and will abort open if reset fails.
> 
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
> ---
>  drivers/vfio/platform/vfio_platform_common.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
> index d84c399..d3141e7 100644
> --- a/drivers/vfio/platform/vfio_platform_common.c
> +++ b/drivers/vfio/platform/vfio_platform_common.c
> @@ -264,6 +264,8 @@ static int vfio_platform_open(void *device_data)
>  	mutex_lock(&driver_lock);
>  
>  	if (!vdev->refcnt) {
> +		const char *extra_dbg = NULL;
> +
>  		ret = vfio_platform_regions_init(vdev);
>  		if (ret)
>  			goto err_reg;
> @@ -272,7 +274,12 @@ static int vfio_platform_open(void *device_data)
>  		if (ret)
>  			goto err_irq;
>  
> -		vfio_platform_call_reset(vdev, NULL);
> +		ret = vfio_platform_call_reset(vdev, &extra_dbg);
> +		if (ret && vdev->reset_required) {
> +			dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n",
> +				 ret, extra_dbg ? extra_dbg : "");
> +			goto err_rst;
> +		}
>  	}
>  
>  	vdev->refcnt++;
> @@ -280,6 +287,8 @@ static int vfio_platform_open(void *device_data)
>  	mutex_unlock(&driver_lock);
>  	return 0;
>  
> +err_rst:
> +	vfio_platform_irq_cleanup(vdev);
>  err_irq:
>  	vfio_platform_regions_cleanup(vdev);
>  err_reg:
> 

Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric