From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Andrzej Hajda <a.hajda@samsung.com>
Cc: andy.shevchenko@gmail.com,
Jernej Skrabec <jernej.skrabec@siol.net>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
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>, Mark Brown <broonie@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [RESEND PATCH v5 5/5] drm/bridge: lvds-codec: simplify error handling code
Date: Thu, 25 Jun 2020 00:18:49 +0300 [thread overview]
Message-ID: <20200624211849.GB29023@pendragon.ideasonboard.com> (raw)
In-Reply-To: <e5f9ecbb-a372-5007-f1df-ba7bfd37ded1@samsung.com>
Hi Andrzej,
On Wed, Jun 24, 2020 at 04:03:30PM +0200, Andrzej Hajda wrote:
> On 24.06.2020 15:33, Laurent Pinchart wrote:
> > 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].
I'm all for using longer lines when that improves readability, but in
this case I think it's easy enough to split the line. A longer line
limit doesn't mean we're forced to generate longer lines :-)
On a side note, I've been working on a C++ userspace project where we
had to decide on a coding style. Line length was one parameter, and we
went for a soft limit of 80 columns, and a hard limit of 120 columns.
This works quite well so far. The only pain point is that clang-format
(we use it, wrapped in a python script, to detect coding style
violations) doesn't understand soft and hard limits for line lengths.
> [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.
>
> >> /* Locate the panel DT node. */
> >> panel_node = of_graph_get_remote_node(dev->of_node, 1, 0);
--
Regards,
Laurent Pinchart
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
prev parent reply other threads:[~2020-06-24 21:18 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200624114134eucas1p2799e0ae76fcb026a0e4bcccc2026b732@eucas1p2.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 0/5] driver core: add probe error check helper Andrzej Hajda
[not found] ` <CGME20200624114135eucas1p26e2e4683d60cebdce7acd55177013992@eucas1p2.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 1/5] driver core: add probe_err log helper Andrzej Hajda
2020-06-24 11:52 ` Rafael J. Wysocki
2020-06-24 12:31 ` Greg Kroah-Hartman
2020-06-24 13:23 ` Laurent Pinchart
2020-06-24 14:04 ` Andrzej Hajda
2020-06-24 13:27 ` Mark Brown
2020-06-24 13:45 ` Andy Shevchenko
2020-06-24 14:02 ` Mark Brown
2020-06-24 15:00 ` Robin Murphy
2020-06-24 15:28 ` Mark Brown
[not found] ` <CGME20200624114136eucas1p1a3a31d95d86754201c7965f26ccd5de0@eucas1p1.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 2/5] driver core: add deferring probe reason to devices_deferred property Andrzej Hajda
2020-06-24 12:11 ` Rafael J. Wysocki
2020-06-24 13:28 ` Andrzej Hajda
2020-06-24 12:34 ` Greg Kroah-Hartman
2020-06-24 13:26 ` Andrzej Hajda
[not found] ` <CGME20200624114136eucas1p1c84f81b1d78e2dbad7ac1b762f0a4b4f@eucas1p1.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 3/5] drivers core: allow probe_err accept integer and pointer types Andrzej Hajda
2020-06-24 12:14 ` Rafael J. Wysocki
2020-06-24 14:44 ` Andrzej Hajda
2020-06-24 14:55 ` Rafael J. Wysocki
2020-06-24 12:30 ` Greg Kroah-Hartman
2020-06-24 14:48 ` Andrzej Hajda
2020-06-24 12:37 ` Robin Murphy
2020-06-24 12:55 ` Andy Shevchenko
2020-06-24 14:25 ` Robin Murphy
2020-06-24 15:04 ` Mark Brown
2020-06-24 15:16 ` Robin Murphy
2020-06-24 19:39 ` Andrzej Hajda
2020-06-25 8:41 ` Andy Shevchenko
2020-06-25 10:19 ` Andrzej Hajda
2020-06-24 13:29 ` Laurent Pinchart
2020-06-24 12:53 ` Andy Shevchenko
2020-06-24 13:12 ` Andrzej Hajda
[not found] ` <CGME20200624114137eucas1p13599d33a0c4a9abf7708bf8c8e77264b@eucas1p1.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 4/5] drm/bridge/sii8620: fix resource acquisition error handling Andrzej Hajda
2020-06-24 13:25 ` Mark Brown
2020-06-24 13:43 ` Andrzej Hajda
2020-06-24 14:11 ` Mark Brown
[not found] ` <CGME20200624114138eucas1p262505da3ad1067720080d20209ff32de@eucas1p2.samsung.com>
2020-06-24 11:41 ` [RESEND PATCH v5 5/5] drm/bridge: lvds-codec: simplify error handling code Andrzej Hajda
2020-06-24 13:33 ` Laurent Pinchart
2020-06-24 14:03 ` Andrzej Hajda
2020-06-24 21:18 ` Laurent Pinchart [this message]
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