Re: [PATCH 2/6] drm/i915: add a helper to free the members of i915_params

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 27/12/2018 14:33, Jani Nikula wrote:
> Abstract the one user in anticipation of more. Set the dangling pointers
> to NULL while at it.
> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>   drivers/gpu/drm/i915/i915_gpu_error.c |  9 +--------
>   drivers/gpu/drm/i915/i915_params.c    | 16 ++++++++++++++++
>   drivers/gpu/drm/i915/i915_params.h    |  1 +
>   3 files changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 8c04479c1586..2bd7991ec9af 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -963,17 +963,10 @@ static void i915_error_object_free(struct drm_i915_error_object *obj)
>   	kfree(obj);
>   }
>   
> -static __always_inline void free_param(const char *type, void *x)
> -{
> -	if (!__builtin_strcmp(type, "char *"))
> -		kfree(*(void **)x);
> -}
>   
>   static void cleanup_params(struct i915_gpu_state *error)
>   {
> -#define FREE(T, x, ...) free_param(#T, &error->params.x);
> -	I915_PARAMS_FOR_EACH(FREE);
> -#undef FREE
> +	i915_params_free(&error->params);
>   }
>   
>   static void cleanup_uc_state(struct i915_gpu_state *error)
> diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
> index ae3ece4ec7ab..81c73bfc7991 100644
> --- a/drivers/gpu/drm/i915/i915_params.c
> +++ b/drivers/gpu/drm/i915/i915_params.c
> @@ -217,3 +217,19 @@ void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
>   	I915_PARAMS_FOR_EACH(DUP);
>   #undef DUP
>   }
> +
> +static __always_inline void free_param(const char *type, void *x)
> +{
> +	if (!__builtin_strcmp(type, "char *")) {
> +		kfree(*(void **)x);
> +		*(void **)x = NULL;
> +	}
> +}
> +
> +/* free the allocated members, *not* the passed in params itself */
> +void i915_params_free(struct i915_params *params)
> +{
> +#define FREE(T, x, ...) free_param(#T, &params->x);
> +	I915_PARAMS_FOR_EACH(FREE);
> +#undef FREE
> +}
> diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
> index fd1cf9415e60..93f665eced16 100644
> --- a/drivers/gpu/drm/i915/i915_params.h
> +++ b/drivers/gpu/drm/i915/i915_params.h
> @@ -79,6 +79,7 @@ extern struct i915_params i915_modparams __read_mostly;
>   
>   void i915_params_dump(const struct i915_params *params, struct drm_printer *p);
>   void i915_params_copy(struct i915_params *dest, const struct i915_params *src);
> +void i915_params_free(struct i915_params *params);
>   
>   #endif
>   
> 

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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