linux-kernel - Re: [PATCH v2 03/16] platform/surface: aggregator: move to_ssam_device() to use container_of

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Message-ID: <Y76oPCJyHktT+Ni9@kroah.com>
Date:   Wed, 11 Jan 2023 13:14:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Maximilian Luz <luzmaximilian@...il.com>
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v2 03/16] platform/surface: aggregator: move
 to_ssam_device() to use container_of_const()

On Wed, Jan 11, 2023 at 01:02:01PM +0100, Maximilian Luz wrote:
> On 1/11/23 12:30, Greg Kroah-Hartman wrote:
> > The driver core is changing to pass some pointers as const, so move
> > to_ssam_device() to use container_of_const() to handle this change.
> > to_ssam_device() now properly keeps the const-ness of the pointer passed
> > into it, while as before it could be lost.
> > 
> > Cc: Maximilian Luz <luzmaximilian@...il.com>
> > Cc: platform-driver-x86@...r.kernel.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> >   include/linux/surface_aggregator/device.h | 5 +----
> >   1 file changed, 1 insertion(+), 4 deletions(-)
> > 
> > diff --git a/include/linux/surface_aggregator/device.h b/include/linux/surface_aggregator/device.h
> > index 46c45d1b6368..24151a0e2c96 100644
> > --- a/include/linux/surface_aggregator/device.h
> > +++ b/include/linux/surface_aggregator/device.h
> > @@ -229,10 +229,7 @@ static inline bool is_ssam_device(struct device *d)
> >    * Return: Returns a pointer to the &struct ssam_device wrapping the given
> >    * device @d.
> >    */
> > -static inline struct ssam_device *to_ssam_device(struct device *d)
> > -{
> > -	return container_of(d, struct ssam_device, dev);
> > -}
> > +#define to_ssam_device(d)	container_of_const(d, struct ssam_device, dev)
> >   /**
> >    * to_ssam_device_driver() - Casts the given device driver to a SSAM client
> 
> A small note in addition to the comment by Hans: I think it might be a
> good idea to convert the to_ssam_device_driver() function as well. I
> could also send this in as a follow-up patch.

Sure, that can be a follow-on patch as it's not needed here.

thanks,

greg k-h