linux-kernel - Re: [PATCH v4 3/7] usb: typec: mux: Check dev_set

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Message-ID: <YiYcPa2XE2MlKVQU@kuha.fi.intel.com>
Date:   Mon, 7 Mar 2022 16:52:45 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Scally <djrscally@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v4 3/7] usb: typec: mux: Check dev_set_name() return value

On Mon, Mar 07, 2022 at 06:33:47AM -0800, Bjorn Andersson wrote:
> On Mon 07 Mar 02:08 PST 2022, Andy Shevchenko wrote:
> 
> > On Sun, Mar 06, 2022 at 07:40:36PM -0800, Bjorn Andersson wrote:
> > > It's possible that dev_set_name() returns -ENOMEM, catch and handle this.
> > 
> > Thanks!
> > Shouldn't we have a Fixes tag and be sent separately for this cycle?
> > 
> 
> It seems appropriate to add:
> 
> Fixes: 3370db35193b ("usb: typec: Registering real device entries for the muxes")
> 
> 
> If the maintainer would prefer to get this into v5.18, it could either
> be picked ahead of the rest of the series, or I can resubmit it on its
> own. I don't think it's a critical fix though.

Me neither.

Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> > > Reported-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > > ---
> > > 
> > > Changes since v3:
> > > - New patch
> > > 
> > >  drivers/usb/typec/mux.c | 14 ++++++++++----
> > >  1 file changed, 10 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
> > > index c8340de0ed49..d2aaf294b649 100644
> > > --- a/drivers/usb/typec/mux.c
> > > +++ b/drivers/usb/typec/mux.c
> > > @@ -131,8 +131,11 @@ typec_switch_register(struct device *parent,
> > >  	sw->dev.class = &typec_mux_class;
> > >  	sw->dev.type = &typec_switch_dev_type;
> > >  	sw->dev.driver_data = desc->drvdata;
> > > -	dev_set_name(&sw->dev, "%s-switch",
> > > -		     desc->name ? desc->name : dev_name(parent));
> > > +	ret = dev_set_name(&sw->dev, "%s-switch", desc->name ? desc->name : dev_name(parent));
> > 
> > We may use shorten form of the ternary
> > 
> > 	ret = dev_set_name(&sw->dev, "%s-switch", desc->name ?: dev_name(parent));
> > 
> > at the same time, but it's up to you.
> > 
> 
> I looked at it, but felt it was an unrelated change and decided to leave
> it as is.
> 
> > Either way code looks good to me,
> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > 
> 
> Thanks,
> Bjorn
> 
> > > +	if (ret) {
> > > +		put_device(&sw->dev);
> > > +		return ERR_PTR(ret);
> > > +	}
> > >  
> > >  	ret = device_add(&sw->dev);
> > >  	if (ret) {
> > > @@ -338,8 +341,11 @@ typec_mux_register(struct device *parent, const struct typec_mux_desc *desc)
> > >  	mux->dev.class = &typec_mux_class;
> > >  	mux->dev.type = &typec_mux_dev_type;
> > >  	mux->dev.driver_data = desc->drvdata;
> > > -	dev_set_name(&mux->dev, "%s-mux",
> > > -		     desc->name ? desc->name : dev_name(parent));
> > > +	ret = dev_set_name(&mux->dev, "%s-mux", desc->name ? desc->name : dev_name(parent));
> > 
> > Ditto.
> > 
> > > +	if (ret) {
> > > +		put_device(&mux->dev);
> > > +		return ERR_PTR(ret);
> > > +	}
> > >  
> > >  	ret = device_add(&mux->dev);
> > >  	if (ret) {
> > > -- 
> > > 2.33.1
> > > 
> > 
> > -- 
> > With Best Regards,
> > Andy Shevchenko
> > 
> > 

-- 
heikki