linux-kernel - Re: [PATCH v1] can: kvaser_usb: Simplify with dev_err

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Message-ID: <20240830-omniscient-impartial-capuchin-6c4490-mkl@pengutronix.de>
Date: Fri, 30 Aug 2024 16:18:00 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: Yan Zhen <yanzhen@...o.com>, mailhol.vincent@...adoo.fr, 
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	linux-can@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	opensource.kernel@...o.com
Subject: Re: [PATCH v1] can: kvaser_usb: Simplify with dev_err_probe()

On 30.08.2024 14:50:44, Alexander Lobakin wrote:
> From: Yan Zhen <yanzhen@...o.com>
> Date: Fri, 30 Aug 2024 19:06:51 +0800
> 
> > dev_err_probe() is used to log an error message during the probe process 
> > of a device. 
> > 
> > It can simplify the error path and unify a message template.
> > 
> > Using this helper is totally fine even if err is known to never
> > be -EPROBE_DEFER.
> > 
> > The benefit compared to a normal dev_err() is the standardized format
> > of the error code, it being emitted symbolically and the fact that
> > the error code is returned which allows more compact error paths.
> > 
> > Signed-off-by: Yan Zhen <yanzhen@...o.com>
> > ---
> >  .../net/can/usb/kvaser_usb/kvaser_usb_core.c  | 42 +++++++------------
> >  1 file changed, 16 insertions(+), 26 deletions(-)
> > 
> > diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
> > index 35b4132b0639..bcf8d870af17 100644
> > --- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
> > +++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
> > @@ -898,10 +898,8 @@ static int kvaser_usb_probe(struct usb_interface *intf,
> >  	ops = driver_info->ops;
> >  
> >  	err = ops->dev_setup_endpoints(dev);
> > -	if (err) {
> > -		dev_err(&intf->dev, "Cannot get usb endpoint(s)");
> > -		return err;
> > -	}
> > +	if (err)
> > +		return dev_err_probe(&intf->dev, err, "Cannot get usb endpoint(s)");
> >  
> >  	dev->udev = interface_to_usbdev(intf);
> >  
> > @@ -912,26 +910,20 @@ static int kvaser_usb_probe(struct usb_interface *intf,
> >  	dev->card_data.ctrlmode_supported = 0;
> >  	dev->card_data.capabilities = 0;
> >  	err = ops->dev_init_card(dev);
> > -	if (err) {
> > -		dev_err(&intf->dev,
> > -			"Failed to initialize card, error %d\n", err);
> > -		return err;
> > -	}
> > +	if (err)
> > +		return dev_err_probe(&intf->dev, err,
> > +					"Failed to initialize card\n");
> 
> The line wrap is wrong in all the places where you used it. It should be
> aligned to the opening brace, like
> 
> 		return dev_err_probe(&intf->dev, err,
> 				     "Failed ...)
> 
> Replace one tab with 5 spaces to fix that, here and in the whole patch.

Fixed while applying.

Thanks,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
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