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

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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@linaro.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.

> >>  /* 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.

	Arnd
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[PATCH 0/4] VFIO platform reset module rework Eric Auger <eric.auger@linaro.org> - 2015-10-18 18:10 +0200
  [PATCH 4/4] vfio: platform: use list of registered reset function Eric Auger <eric.auger@linaro.org> - 2015-10-18 18:10 +0200
  [PATCH 3/4] vfio: platform: add compat in vfio_platform_device Eric Auger <eric.auger@linaro.org> - 2015-10-18 18:10 +0200
  [PATCH 1/4] vfio: platform: add capability to register a reset function Eric Auger <eric.auger@linaro.org> - 2015-10-18 18:10 +0200
    Re: [PATCH 1/4] vfio: platform: add capability to register a reset function Arnd Bergmann <arnd@arndb.de> - 2015-10-19 15:10 +0200
    Re: [PATCH 1/4] vfio: platform: add capability to register a reset  function Alex Williamson <alex.williamson@redhat.com> - 2015-10-19 21:50 +0200
      Re: [PATCH 1/4] vfio: platform: add capability to register a reset  function Eric Auger <eric.auger@linaro.org> - 2015-10-20 19:50 +0200
  [PATCH 2/4] vfio: platform: reset: calxedaxgmac: add reset function registration Eric Auger <eric.auger@linaro.org> - 2015-10-18 18:10 +0200
    Re: [PATCH 2/4] vfio: platform: reset: calxedaxgmac: add reset function registration Arnd Bergmann <arnd@arndb.de> - 2015-10-19 15:10 +0200
      Re: [PATCH 2/4] vfio: platform: reset: calxedaxgmac: add reset  function registration Eric Auger <eric.auger@linaro.org> - 2015-10-19 15:20 +0200
        Re: [PATCH 2/4] vfio: platform: reset: calxedaxgmac: add reset function registration Arnd Bergmann <arnd@arndb.de> - 2015-10-19 15:30 +0200
          Re: [PATCH 2/4] vfio: platform: reset: calxedaxgmac: add reset  function registration Eric Auger <eric.auger@linaro.org> - 2015-10-19 15:40 +0200
  Re: [PATCH 0/4] VFIO platform reset module rework Arnd Bergmann <arnd@arndb.de> - 2015-10-19 15:10 +0200

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