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

From: Eric Auger
Date: Mon Oct 19 2015 - 09:17:42 EST


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@xxxxxxxxxx>"
>> #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
>
>> /* 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.
>
>> + ret = register_reset(THIS_MODULE, COMPAT,
>> + vfio_platform_calxedaxgmac_reset);
>
> This is whitespace damaged, the second line needs to be indented
> to the opening braces.
ok
>
> I would also suggest defining register_reset as a macro that
> implicitly passes the THIS_MODULE argument, as other subsystems
> do.
ok

Thanks

Best Regards

Eric
>
> Arnd
>

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