linux-kernel - Re: [PATCH 2/4] vfio: platform: reset: calxedaxgmac: add reset function registration

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Date:	Mon, 19 Oct 2015 15:34:31 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, eric.auger@...com,
	alex.williamson@...hat.com, b.reynal@...tualopensystems.com,
	kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, christoffer.dall@...aro.org,
	patches@...aro.org
Subject: Re: [PATCH 2/4] vfio: platform: reset: calxedaxgmac: add reset
 function registration

On 10/19/2015 03:25 PM, Arnd Bergmann wrote:
> On Monday 19 October 2015 15:17:30 Eric Auger wrote:
>> Hi Arnd,
>> On 10/19/2015 03:04 PM, Arnd Bergmann wrote:
>>> On Sunday 18 October 2015 18:00:13 Eric Auger wrote:
>>>> diff --git a/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c b/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c
>>>> index 619dc7d..4f76b17 100644
>>>> --- a/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c
>>>> +++ b/drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c
>>>> @@ -29,8 +29,7 @@
>>>>  #define DRIVER_VERSION  "0.1"
>>>>  #define DRIVER_AUTHOR   "Eric Auger <eric.auger@...aro.org>"
>>>>  #define DRIVER_DESC     "Reset support for Calxeda xgmac vfio platform device"
>>>> -
>>>> -#define CALXEDAXGMAC_COMPAT "calxeda,hb-xgmac"
>>>> +#define COMPAT		"calxeda,hb-xgmac"
>>>
>>> Why the rename?
>> This define was not used. Since the code is meant to be duplicated from
>> one reset module to the other I thought it did not bring any have a
>> specialized name
> 
> I'd say it would be clearer to remove the macro then, and pass the
> string literal in the function call.
OK
> 
>>>>  /* XGMAC Register definitions */
>>>>  #define XGMAC_CONTROL           0x00000000      /* MAC Configuration */
>>>> @@ -80,6 +79,43 @@ int vfio_platform_calxedaxgmac_reset(struct vfio_platform_device *vdev)
>>>>  }
>>>>  EXPORT_SYMBOL_GPL(vfio_platform_calxedaxgmac_reset);
>>>>  
>>>> +static int __init vfio_platform_calxedaxgmac_init(void)
>>>> +{
>>>> +	int (*register_reset)(struct module *, char*,
>>>> +				vfio_platform_reset_fn_t);
>>>> +	int ret;
>>>> +
>>>> +	register_reset = symbol_get(vfio_platform_register_reset);
>>>> +	if (!register_reset)
>>>> +		return -EINVAL;
>>>
>>> I don't understand what you do the symbol_get() here for.
>>> Why not just call that function directly
>> the function is implemented in a separate module. This is just to make
>> sure the vfio-platform module is loaded, in case the end-user attempts
>> to load the reset module without having this latter loaded.
> 
> The module loader does all this for you.
Ah OK

I will respin shortly taking into account all your comments

Thanks for your time!

Best Regards

Eric


> 
> 	Arnd
> 

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