linux-kernel - Re: [PATCH v6 1/4] mfd: add support for Diolan DLN-2 devices

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Date:	Tue, 7 Oct 2014 21:01:27 +0300
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	Johan Hovold <johan@...nel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Daniel Baluta <daniel.baluta@...el.com>,
	Laurentiu Palcu <laurentiu.palcu@...el.com>,
	linux-usb@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH v6 1/4] mfd: add support for Diolan DLN-2 devices

On Tue, Oct 7, 2014 at 8:10 PM, Johan Hovold <johan@...nel.org> wrote:
> On Mon, Oct 06, 2014 at 03:17:22PM +0300, Octavian Purdila wrote:
>> On Fri, Oct 3, 2014 at 8:12 PM, Johan Hovold <johan@...nel.org> wrote:
>> >
>> > On Thu, Sep 25, 2014 at 07:07:31PM +0300, Octavian Purdila wrote:
>> > > This patch implements the USB part of the Diolan USB-I2C/SPI/GPIO
>> > > Master Adapter DLN-2. Details about the device can be found here:
>> > >
>>
>> <snip>
>>
>> > > +
>> > > +             ret = dln2_submit_urb(dln2, dln2->rx_urb[i], GFP_KERNEL);
>> > > +             if (ret < 0)
>> > > +                     return ret;
>> >
>> > Is it really worth having this helper only to save a couple of lines on
>> > a dev_err? If you do all resubmissions on completion inline in the
>> > handler, you only have three places where usb_submit_urb is called.
>> >
>>
>> I moved the completion in the handler as you suggested. I have kept
>> the helper, would you prefer to remove it?
>
> Moved the "completion"? I was suggesting that the URB resubmission
> should be done inline the URB completion handler.
>
> [ "Completion" may be a little ambiguous. The URB callback is called an
> URB completion handler. Not be confused with the completion structures
> you use to wait for responses. ]
>

Sorry, I meant to say resubmission instead of completion.

> It's fine to keep the helper as long as it's clear that the urb has been
> "cached" and should not be resubmitted (inline) in the completion
> handler in that case.
>

Not sure I follow you here. I kept the helper and I call it from the
completion handler, from free_rx_slot and from dln2_setup_rx_ubs.

>
>> <snip>
>>
>> > > +     id = dln2->usb_dev->bus->busnum << 8 | dln2->usb_dev->devnum;
>> >
>> > After giving this some more thought, I think you should just
>> > use PLATFORM_DEVID_AUTO as id. I have submitted a series to fix the
>> > other USB MFD drivers and add a convenience helper to register
>> > hotpluggable MFDs here:
>> >
>>
>> OK, I will use PLATFORM_DEVID_AUTO for now. If your series merges
>> first and I have to resubmit mine, I will switch to using
>> mfd_add_hotplug_devices.
>
> Lee merged the helper function earlier today.
>

Yep, noticed that, I did a rebase earlier.
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