linux-kernel - Re: [RESEND PATCH v5 5/5] drm/bridge: lvds-codec: simplify error handling code

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Date:   Wed, 24 Jun 2020 16:03:30 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Jernej Skrabec <jernej.skrabec@...l.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-kernel@...r.kernel.org,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>, andy.shevchenko@...il.com,
        Mark Brown <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RESEND PATCH v5 5/5] drm/bridge: lvds-codec: simplify error
 handling code


On 24.06.2020 15:33, Laurent Pinchart wrote:
> Hi Andrzej,
>
> On Wed, Jun 24, 2020 at 01:41:27PM +0200, Andrzej Hajda wrote:
>> Using probe_err code has following advantages:
>> - shorter code,
>> - recorded defer probe reason for debugging,
>> - uniform error code logging.
>>
>> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
>> ---
>>   drivers/gpu/drm/bridge/lvds-codec.c | 9 ++-------
>>   1 file changed, 2 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/lvds-codec.c b/drivers/gpu/drm/bridge/lvds-codec.c
>> index 24fb1befdfa2..c76fa0239e39 100644
>> --- a/drivers/gpu/drm/bridge/lvds-codec.c
>> +++ b/drivers/gpu/drm/bridge/lvds-codec.c
>> @@ -71,13 +71,8 @@ static int lvds_codec_probe(struct platform_device *pdev)
>>   	lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
>>   	lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
>>   							     GPIOD_OUT_HIGH);
>> -	if (IS_ERR(lvds_codec->powerdown_gpio)) {
>> -		int err = PTR_ERR(lvds_codec->powerdown_gpio);
>> -
>> -		if (err != -EPROBE_DEFER)
>> -			dev_err(dev, "powerdown GPIO failure: %d\n", err);
>> -		return err;
>> -	}
>> +	if (IS_ERR(lvds_codec->powerdown_gpio))
>> +		return probe_err(dev, lvds_codec->powerdown_gpio, "powerdown GPIO failure\n");
> Line wrap please.


I hoped that with latest checkpatch line length limit increase from 80 
to 100 it is acceptable :) but apparently not [1].

[1]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bdc48fa11e46f867ea4d75fa59ee87a7f48be144


>
> It bothers me that the common pattern of writing the error code at the
> end of the message isn't possible anymore. Maybe I'll get used to it,
> but it removes some flexibility.


Yes, but it gives uniformity :) and now with %pe printk format it 
changes anyway.


Regards

Andrzej


>
>>   
>>   	/* Locate the panel DT node. */
>>   	panel_node = of_graph_get_remote_node(dev->of_node, 1, 0);