Re: [PATCH v13 03/10] drm/display: Add Type-C switch helpers - Pin-yen Lin

From: Pin-yen Lin <treapking@chromium.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "Andrzej Hajda" <andrzej.hajda@intel.com>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Robert Foss" <rfoss@kernel.org>,
	"Laurent Pinchart" <Laurent.pinchart@ideasonboard.com>,
	"Jonas Karlman" <jonas@kwiboo.se>,
	"Jernej Skrabec" <jernej.skrabec@gmail.com>,
	"David Airlie" <airlied@gmail.com>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
	"Daniel Scally" <djrscally@gmail.com>,
	"Heikki Krogerus" <heikki.krogerus@linux.intel.com>,
	"Sakari Ailus" <sakari.ailus@linux.intel.com>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	"Prashant Malani" <pmalani@chromium.org>,
	"Benson Leung" <bleung@chromium.org>,
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	"Xin Ji" <xji@analogixsemi.com>,
	"Javier Martinez Canillas" <javierm@redhat.com>,
	"Lyude Paul" <lyude@redhat.com>,
	linux-kernel@vger.kernel.org,
	"AngeloGioacchino Del Regno"
	<angelogioacchino.delregno@collabora.com>,
	chrome-platform@lists.linux.dev,
	"Nícolas F . R . A . Prado" <nfraprado@collabora.com>,
	"Marek Vasut" <marex@denx.de>,
	"Hsin-Yi Wang" <hsinyi@chromium.org>,
	devicetree@vger.kernel.org, "Allen Chen" <allen.chen@ite.com.tw>,
	dri-devel@lists.freedesktop.org,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"Stephen Boyd" <swboyd@chromium.org>,
	linux-acpi@vger.kernel.org,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"Douglas Anderson" <dianders@chromium.org>,
	"Imre Deak" <imre.deak@intel.com>,
	"Jani Nikula" <jani.nikula@intel.com>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>
Subject: Re: [PATCH v13 03/10] drm/display: Add Type-C switch helpers
Date: Thu, 9 Mar 2023 18:20:44 +0800	[thread overview]
Message-ID: <CAEXTbpfQTGsZVy4m0MXQ0AK-N66F3OHwFmT_kNThMPxZFVP6ow@mail.gmail.com> (raw)
In-Reply-To: <ZAiptm03HzQila0M@smile.fi.intel.com>

Hi Andy,

On Wed, Mar 8, 2023 at 11:29 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Wed, Mar 08, 2023 at 06:20:14PM +0800, Pin-yen Lin wrote:
> > On Mon, Mar 6, 2023 at 7:49 PM Andy Shevchenko
> > > On Fri, Mar 03, 2023 at 10:33:43PM +0800, Pin-yen Lin wrote:
>
> ...
>
> > > > +     switch_desc->typec_ports = devm_kcalloc(dev, switch_desc->num_typec_switches,
> > > > +                                             sizeof(struct drm_dp_typec_port_data),
> > > > +                                             GFP_KERNEL);
> > > > +     if (!switch_desc->typec_ports)
> > > > +             return -ENOMEM;
> > >
> > > How often this function _can_ be called during the runtime?
> > > If it's _possible_ to call it infinite times, consider *not* using devm.
> >
> > I would expect this function to be only called during driver probing,
> > and this is the case for the current users in this series. So I think
> > this is only called once if EPROBDE_DEFER doesn't count.
>
> No, deferred probe is not counted.
>
> Can you add a word somewhere in the comment(?) to make this clear?

Sure. I'll add some note in the comments about this.
>
> --
> With Best Regards,
> Andy Shevchenko
>
>
Thanks and regards,
Pin-yen