linux-kernel - Re: [RESEND PATCH v5 3/5] drivers core: allow probe

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Date:   Wed, 24 Jun 2020 15:12:55 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Andy Shevchenko <andy.shevchenko@...il.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 Mailing List <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>,
        Mark Brown <broonie@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RESEND PATCH v5 3/5] drivers core: allow probe_err accept
 integer and pointer types


On 24.06.2020 14:53, Andy Shevchenko wrote:
> On Wed, Jun 24, 2020 at 2:41 PM Andrzej Hajda <a.hajda@...sung.com> wrote:
>> Many resource acquisition functions return error value encapsulated in
>> pointer instead of integer value. To simplify coding we can use macro
>> which will accept both types of error.
>> With this patch user can use:
>>          probe_err(dev, ptr, ...)
>> instead of:
>>          probe_err(dev, PTR_ERR(ptr), ...)
>> Without loosing old functionality:
>>          probe_err(dev, err, ...)
> ...
>
>> + * This helper implements common pattern present in probe functions for error
>> + * checking: print message if the error is not -EPROBE_DEFER and propagate it.
>> + * In case of -EPROBE_DEFER it sets defer probe reason, which can be checked
>> + * later by reading devices_deferred debugfs attribute.
>> + * It replaces code sequence:
>> + *     if (err != -EPROBE_DEFER)
>> + *             dev_err(dev, ...);
> Btw, we have now %pe. Can you consider to use it?


OK, I haven't noticed it finally appeared.


>
>> + *     return err;
>> + * with
>> + *     return probe_err(dev, err, ...);
>> + *
>> + * Returns @err.
>> + *
>> + */
>> +#define probe_err(dev, err, args...) __probe_err(dev, (long)(err), args)
> Can't we use PTR_ERR() here?


Nope, I want to accept both types: int and pointer.


Regards

Andrzej


>