linux-kernel - Re: [PATCH V5 2/6] vfio: platform: move reset call to a common function

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Date:	Mon, 23 May 2016 22:14:59 -0400
From:	Sinan Kaya <okaya@...eaurora.org>
To:	Eric Auger <eric.auger@...aro.org>, kvm@...r.kernel.org,
	timur@...eaurora.org, cov@...eaurora.org, jcm@...hat.com
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>,
	Alex Williamson <alex.williamson@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 2/6] vfio: platform: move reset call to a common
 function

On 5/23/2016 9:02 AM, Eric Auger wrote:
> Hi Sinan,
> On 05/16/2016 04:13 AM, Sinan Kaya wrote:
>> The reset call sequence seems to replicate itself multiple times
>> across the file. Grouping them together for maintenance reasons.
>>
>> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
>> ---
>>  drivers/vfio/platform/vfio_platform_common.c | 31 ++++++++++++++--------------
>>  1 file changed, 15 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
>> index 08fd7c2..cb91dd3 100644
>> --- a/drivers/vfio/platform/vfio_platform_common.c
>> +++ b/drivers/vfio/platform/vfio_platform_common.c
>> @@ -134,6 +134,18 @@ static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
>>  	kfree(vdev->regions);
>>  }
>>  
>> +static int vfio_platform_call_reset(struct vfio_platform_device *vdev)
>> +{
>> +	if (vdev->of_reset) {
>> +		dev_info(vdev->device, "reset\n");
>> +		vdev->of_reset(vdev);
>> +		return 0;
> you should return vdev->of_reset(vdev) to keep the existing
> VFIO_DEVICE_RESET ioctl behavior

will do.

> 
> Once fixed, Reviewed-by: Eric Auger <eric.auger@...aro.org>
> 
thanks.

> Besides, but this goes beyond the scope of your series, maybe we should
> reconsider in the future what happens in case the reset fails on
> open/release.
> 

I like giving an error immediately to be honest on open. 

> Best Regards
> 
> Eric
>> +	}
>> +
>> +	dev_warn(vdev->device, "no reset function found!\n");
>> +	return -EINVAL;
>> +}
>> +
>>  static void vfio_platform_release(void *device_data)
>>  {
>>  	struct vfio_platform_device *vdev = device_data;
>> @@ -141,12 +153,7 @@ static void vfio_platform_release(void *device_data)
>>  	mutex_lock(&driver_lock);
>>  
>>  	if (!(--vdev->refcnt)) {
>> -		if (vdev->of_reset) {
>> -			dev_info(vdev->device, "reset\n");
>> -			vdev->of_reset(vdev);
>> -		} else {
>> -			dev_warn(vdev->device, "no reset function found!\n");
>> -		}
>> +		vfio_platform_call_reset(vdev);
>>  		vfio_platform_regions_cleanup(vdev);
>>  		vfio_platform_irq_cleanup(vdev);
>>  	}
>> @@ -175,12 +182,7 @@ static int vfio_platform_open(void *device_data)
>>  		if (ret)
>>  			goto err_irq;
>>  
>> -		if (vdev->of_reset) {
>> -			dev_info(vdev->device, "reset\n");
>> -			vdev->of_reset(vdev);
>> -		} else {
>> -			dev_warn(vdev->device, "no reset function found!\n");
>> -		}
>> +		vfio_platform_call_reset(vdev);
>>  	}
>>  
>>  	vdev->refcnt++;
>> @@ -312,10 +314,7 @@ static long vfio_platform_ioctl(void *device_data,
>>  		return ret;
>>  
>>  	} else if (cmd == VFIO_DEVICE_RESET) {
>> -		if (vdev->of_reset)
>> -			return vdev->of_reset(vdev);
>> -		else
>> -			return -EINVAL;
>> +		return vfio_platform_call_reset(vdev);
>>  	}
>>  
>>  	return -ENOTTY;
>>
> 


-- 
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project