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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Andrzej Hajda <a.hajda@samsung.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Javier Martinez Canillas <javierm@redhat.com>,
	linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
	Mark Brown <broonie@kernel.org>
Subject: Re: [PATCH 1/3] driver core: add probe_err log helper
Date: Tue, 16 Oct 2018 16:55:00 +0300	[thread overview]
Message-ID: <CAHp75VecquoNrzOuRvWcZ-Qa1b-5P0V0MWq=sNj-SnVcd2EhRw@mail.gmail.com> (raw)
In-Reply-To: <20181016125543eucas1p1f23b3482179a9cd465f509e0abf782c1~eGAecmAv93038330383eucas1p1j@eucas1p1.samsung.com>

On Tue, Oct 16, 2018 at 3:55 PM Andrzej Hajda <a.hajda@samsung.com> wrote:
> On 16.10.2018 13:29, Andrzej Hajda wrote:
> > On 16.10.2018 13:01, Andy Shevchenko wrote:
> >> On Tue, Oct 16, 2018 at 10:22 AM Andrzej Hajda <a.hajda@samsung.com> wrote:
> >>> During probe every time driver gets resource it should usually check for error
> >>> printk some message if it is not -EPROBE_DEFER and return the error. This
> >>> pattern is simple but requires adding few lines after any resource acquisition
> >>> code, as a result it is often omited or implemented only partially.
> >>> probe_err helps to replace such code seqences with simple call, so code:
> >>>         if (err != -EPROBE_DEFER)
> >>>                 dev_err(dev, ...);
> >>>         return err;
> >>> becomes:
> >>>         return probe_err(dev, err, ...);

> >>> +               va_start(args, fmt);
> >>> +
> >>> +               vaf.fmt = fmt;
> >>> +               vaf.va = &args;
> >>> +
> >>> +               __dev_printk(KERN_ERR, dev, &vaf);

> >> It would be nice to print an error code as well, wouldn't it?
> > Hmm, on probe fail error is printed anyway (with exception of
> > EPROBE_DEFER, ENODEV and ENXIO):
> >     "probe of %s failed with error %d\n"
> > On the other side currently some drivers prints the error code anyway
> > via dev_err or similar, so I guess during conversion to probe_err it
> > should be removed then.
> >
> > If we add error code to probe_err is it OK to report it this way?
> >     dev_err(dev, "%V, %d\n", &vaf, err);
>
> Ups, I forgot that message passed to probe_err will contain already
> newline character.

You may consider not to pass it.

> So the err must be before message passed to probe_err, for example:
>     dev_err(dev, "err=%d: %V\n", err, &vaf);

> Is it OK?

For me would work either (no \n in the message, or err preceding the message).

-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2018-10-16 13:55 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20181016072248eucas1p18943ce87e084797cd597afd4edb65a65@eucas1p1.samsung.com>
2018-10-16  7:22 ` [PATCH 0/3] driver core: add probe error check helper Andrzej Hajda
     [not found]   ` <CGME20181016072249eucas1p2303b8c06a9f7c839a971fe065b0c752e@eucas1p2.samsung.com>
2018-10-16  7:22     ` [PATCH 1/3] driver core: add probe_err log helper Andrzej Hajda
2018-10-16  9:32       ` Javier Martinez Canillas
2018-10-16 10:27       ` Mark Brown
2018-10-16 11:09         ` Greg Kroah-Hartman
2018-10-16 11:01       ` Andy Shevchenko
2018-10-16 11:29         ` Andrzej Hajda
     [not found]         ` <605bd00e-ed0d-4259-bdc3-1784b2b3b16a@samsung.com>
2018-10-16 12:55           ` Andrzej Hajda
2018-10-16 13:55             ` Andy Shevchenko [this message]
     [not found]               ` <CGME20181017085832eucas1p23dbb86230149a13634b8a091c3b1301f@eucas1p2.samsung.com>
2018-10-17  8:58                 ` [PATCH v2 " Andrzej Hajda
2018-10-17  9:56                   ` Mark Brown
2018-10-17 11:30                   ` Andy Shevchenko
2018-10-17 11:49                   ` Greg Kroah-Hartman
2018-10-17 11:29               ` [PATCH " Russell King - ARM Linux
2018-10-17 11:33                 ` Andy Shevchenko
     [not found]                   ` <CGME20181017132209eucas1p1d23615adc15663caaffb3c117dc61151@eucas1p1.samsung.com>
2018-10-17 13:22                     ` [PATCH v3 1/4] " Andrzej Hajda
2018-10-18  1:45                 ` [PATCH 1/3] " Joe Perches
     [not found]   ` <CGME20181016072249eucas1p28855602564eb74a771fe521712962680@eucas1p2.samsung.com>
2018-10-16  7:22     ` [PATCH 2/3] driver core: add deferring probe reason to devices_deferred property Andrzej Hajda
2018-10-16  9:25       ` Mark Brown
2018-10-16  9:47       ` Javier Martinez Canillas
2018-10-16 13:42       ` Andy Shevchenko
     [not found]         ` <CGME20181017085952eucas1p2ff93b96d300aab2dc70b97bf266978ab@eucas1p2.samsung.com>
2018-10-17  8:59           ` [PATCH v2 " Andrzej Hajda
2018-10-17 11:35             ` Andy Shevchenko
     [not found]               ` <CGME20181017132404eucas1p2a413f6853af8f11a874650b6289d56cf@eucas1p2.samsung.com>
2018-10-17 13:24                 ` [PATCH v3 2/4] " Andrzej Hajda
2018-10-17 14:17                   ` Andy Shevchenko
     [not found]                     ` <CGME20181018064916eucas1p22f03a19eb09cecdb0061dc5a4bf99ce6@eucas1p2.samsung.com>
2018-10-18  6:49                       ` [PATCH v4 2/3] " Andrzej Hajda
     [not found]   ` <CGME20181016072250eucas1p1a763670c8509d20a6e6847eadb246817@eucas1p1.samsung.com>
2018-10-16  7:22     ` [PATCH 3/3] drivers: use probe_err function in obvious cases Andrzej Hajda
2018-10-16  9:52       ` Javier Martinez Canillas
2018-10-16 13:51       ` Andy Shevchenko
2018-10-17  9:10         ` Andrzej Hajda

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