linux-kernel - Re: [PATCH v3 05/17] usb: typec: Add device managed typec_switch

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Message-ID: <ZsTPeEsS1m4Y8imq@smile.fi.intel.com>
Date: Tue, 20 Aug 2024 20:16:40 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Stephen Boyd <swboyd@...omium.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev, devicetree@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Benson Leung <bleung@...omium.org>,
	Conor Dooley <conor+dt@...nel.org>, Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	dri-devel@...ts.freedesktop.org,
	Guenter Roeck <groeck@...omium.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Lee Jones <lee@...nel.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
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	Tzung-Bi Shih <tzungbi@...nel.org>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
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	Ivan Orlov <ivan.orlov0322@...il.com>, linux-acpi@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v3 05/17] usb: typec: Add device managed
 typec_switch_register()

On Tue, Aug 20, 2024 at 10:01:07AM -0700, Stephen Boyd wrote:
> Quoting Andy Shevchenko (2024-08-20 03:16:09)
> > On Mon, Aug 19, 2024 at 03:38:19PM -0700, Stephen Boyd wrote:
> > > +     ptr = devres_alloc(devm_typec_switch_unregister, sizeof(*ptr), GFP_KERNEL);
> > > +     if (!ptr)
> > > +             return ERR_PTR(-ENOMEM);
> > > +
> > > +     switch_dev = typec_switch_register(parent ,desc);

(Side note: wrong location of the white space)

> > > +     if (!IS_ERR(switch_dev)) {

(Side note: positive conditional is okay)

> > > +             *ptr = switch_dev;
> > > +             devres_add(parent, ptr);
> > > +     } else {
> > > +             devres_free(ptr);
> > > +     }
> >
> > devm_add_action_or_reset() ?
> 
> No. We don't want to call the 'action' devm_typec_switch_unregister()
> when it fails because that would unregister a switch that has never been
> registered.

Hmm... With devm_add_action_or_reset() we first do things and then try to add
them to the managed resources. In that case it won't be like you described.

What do I miss?

-- 
With Best Regards,
Andy Shevchenko