linux-kernel - Re: [PATCH 30/36] drm/i915/huc: use const struct bus

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Date:   Wed, 15 Mar 2023 10:15:01 +0000
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     rafael@...nel.org, Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        Alan Previn <alan.previn.teres.alexis@...el.com>,
        John Harrison <John.C.Harrison@...el.com>,
        Tony Ye <tony.ye@...el.com>,
        Vitaly Lubart <vitaly.lubart@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 30/36] drm/i915/huc: use const struct bus_type pointers


On 13/03/2023 18:29, Greg Kroah-Hartman wrote:
> The struct bus_type pointers in the functions
> intel_huc_register_gsc_notifier() and
> intel_huc_unregister_gsc_notifier() should be a const pointer, as the
> structure is not modified anywhere in the functions, and the pointer
> they are passed will be a const * in the near future.
> 
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>
> Cc: Alan Previn <alan.previn.teres.alexis@...el.com>
> Cc: John Harrison <John.C.Harrison@...el.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Tony Ye <tony.ye@...el.com>
> Cc: Vitaly Lubart <vitaly.lubart@...el.com>
> Cc: intel-gfx@...ts.freedesktop.org
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
> Note, this is a patch that is a prepatory cleanup as part of a larger
> series of patches that is working on resolving some old driver core
> design mistakes.  It will build and apply cleanly on top of 6.3-rc2 on
> its own, but I'd prefer if I could take it through my driver-core tree
> so that the driver core changes can be taken through there for 6.4-rc1.

Sounds fine to me.

Acked-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>

Regards,

Tvrtko

> 
>   drivers/gpu/drm/i915/gt/uc/intel_huc.c | 4 ++--
>   drivers/gpu/drm/i915/gt/uc/intel_huc.h | 4 ++--
>   2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
> index 410905da8e97..8b453bd7c953 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
> @@ -183,7 +183,7 @@ static int gsc_notifier(struct notifier_block *nb, unsigned long action, void *d
>   	return 0;
>   }
>   
> -void intel_huc_register_gsc_notifier(struct intel_huc *huc, struct bus_type *bus)
> +void intel_huc_register_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus)
>   {
>   	int ret;
>   
> @@ -200,7 +200,7 @@ void intel_huc_register_gsc_notifier(struct intel_huc *huc, struct bus_type *bus
>   	}
>   }
>   
> -void intel_huc_unregister_gsc_notifier(struct intel_huc *huc, struct bus_type *bus)
> +void intel_huc_unregister_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus)
>   {
>   	if (!huc->delayed_load.nb.notifier_call)
>   		return;
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.h b/drivers/gpu/drm/i915/gt/uc/intel_huc.h
> index 52db03620c60..05d4832f8461 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_huc.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.h
> @@ -51,8 +51,8 @@ int intel_huc_check_status(struct intel_huc *huc);
>   void intel_huc_update_auth_status(struct intel_huc *huc);
>   bool intel_huc_is_authenticated(struct intel_huc *huc);
>   
> -void intel_huc_register_gsc_notifier(struct intel_huc *huc, struct bus_type *bus);
> -void intel_huc_unregister_gsc_notifier(struct intel_huc *huc, struct bus_type *bus);
> +void intel_huc_register_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus);
> +void intel_huc_unregister_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus);
>   
>   static inline int intel_huc_sanitize(struct intel_huc *huc)
>   {