Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [RESEND PATCH v5 5/5] drm/bridge: lvds-codec: simplify error
 handling code
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc:     Jernej Skrabec <jernej.skrabec@siol.net>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        linux-kernel@vger.kernel.org,
        "open list:DRM DRIVERS" <dri-devel@lists.freedesktop.org>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Jonas Karlman <jonas@kwiboo.se>, andy.shevchenko@gmail.com,
        Mark Brown <broonie@kernel.org>,
        linux-arm-kernel@lists.infradead.org,
        Marek Szyprowski <m.szyprowski@samsung.com>
From:   Andrzej Hajda <a.hajda@samsung.com>
Message-ID: <e5f9ecbb-a372-5007-f1df-ba7bfd37ded1@samsung.com>
Date:   Wed, 24 Jun 2020 16:03:30 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101
        Thunderbird/68.8.1
MIME-Version: 1.0
In-Reply-To: <20200624133312.GC5980@pendragon.ideasonboard.com>
Content-Transfer-Encoding: 7bit
Content-Language: en-GB
Content-Type: text/plain; charset="utf-8"
CMS-TYPE: 201P
References: <20200624114127.3016-1-a.hajda@samsung.com>
        <CGME20200624114138eucas1p262505da3ad1067720080d20209ff32de@eucas1p2.samsung.com>
        <20200624114127.3016-6-a.hajda@samsung.com>
        <20200624133312.GC5980@pendragon.ideasonboard.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


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@samsung.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);