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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Andres Salomon <dilinger@queued.net>
Cc: Samuel Ortiz <sameo@linux.intel.com>,
	linux-kernel@vger.kernel.org,
	Mark Brown <broonie@opensource.wolfsonmicro.com>,
	Peter Ujfalusi <peter.ujfalusi@nokia.com>,
	Liam Girdwood <lrg@slimlogic.co.uk>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>,
	Timur Tabi <timur@freescale.com>,
	linux-input@vger.kernel.org, alsa-devel@alsa-project.org
Subject: Re: [PATCH 12/19] twl4030: mfd_cell is now implicitly available to drivers
Date: Wed, 2 Feb 2011 22:53:39 -0800	[thread overview]
Message-ID: <20110203065339.GA5592@core.coreip.homeip.net> (raw)
In-Reply-To: <20110202223959.244b4a01@queued.net>

On Wed, Feb 02, 2011 at 10:39:59PM -0800, Andres Salomon wrote:
> On Wed, 2 Feb 2011 22:05:21 -0800
> Dmitry Torokhov <dmitry.torokhov@gmail.com> wrote:
> 
> > On Wed, Feb 02, 2011 at 08:15:22PM -0800, Andres Salomon wrote:
> > >  static int __devinit twl4030_vibra_probe(struct platform_device
> > > *pdev) {
> > > -	struct twl4030_codec_vibra_data *pdata =
> > > pdev->dev.platform_data;
> > > +	struct twl4030_codec_vibra_data *pdata =
> > > platform_get_drvdata(pdev);
> > 
> > No, device's drvdata belongs to _this_ driver, and it is supposed to
> > manage it and use as it sees fit.
> 
> Right, so it's used to pass data to the probe function; once the probe
> function has obtained the pdata pointer, it's free to do with it what
> it will.
> 
> 
> > 
> > Note platform_set_drvdata(pdev, info) later in this function along
> > with platform_set_drvdata(pdev, NULL) in twl4030_vibra_remove(),
> > which means that with your change you will be able to bind the device
> > only once.
> > 
> 
> Hm, good point; if the driver is reloaded, the pdev that was created by
> mfd-core will have lost the pointer to pdata.
> 
> I wonder if I should be using mfd's driver_data instead. I used
> platform_data because a bunch of drivers had already made use of it to
> pass cell information..

Then they are doing it incorrectly. One possible way is to have parent
device carry relevant data in its drvdata and have children get it from
there.

-- 
Dmitry

  reply	other threads:[~2011-02-03  6:53 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-03  3:54 [RFC] [PATCH 0/19] mfd sharing support Andres Salomon
2011-02-03  3:55 ` [PATCH 01/19] mfd-core: unconditionally add mfd_cell to every platform_device Andres Salomon
2011-02-03  3:58 ` [PATCH 02/19] jz4740: mfd_cell is now implicitly available to drivers Andres Salomon
2011-02-03  8:09   ` Jean Delvare
2011-02-03  4:01 ` [PATCH 03/19] ab3550: " Andres Salomon
2011-02-04  8:20   ` Mattias Wallin
2011-02-03  4:03 ` [PATCH 04/19] ab3100: " Andres Salomon
2011-02-03 12:52   ` Linus Walleij
2011-02-03  4:04 ` [PATCH 05/19] asic3: " Andres Salomon
2011-02-03  4:05 ` [PATCH 06/19] htc-pasic3: " Andres Salomon
2011-02-03  4:08 ` [PATCH 07/19] timberdale: " Andres Salomon
2011-03-31 23:05   ` Grant Likely
2011-04-01 11:20     ` Samuel Ortiz
2011-04-01 17:47       ` Andres Salomon
2011-04-01 17:56         ` Grant Likely
2011-04-01 18:00           ` Grant Likely
2011-04-01 23:52           ` Samuel Ortiz
2011-04-01 23:58             ` Grant Likely
2011-04-02  0:10               ` Andres Salomon
2011-04-04 10:03               ` Samuel Ortiz
2011-04-05  3:04                 ` Grant Likely
2011-04-06 15:23                   ` Samuel Ortiz
2011-04-06 15:58                     ` Greg KH
2011-04-06 17:05                       ` Samuel Ortiz
2011-04-06 17:16                         ` Ben Hutchings
2011-04-06 17:51                           ` Samuel Ortiz
2011-04-06 18:07                             ` Ben Hutchings
2011-04-06 17:56                         ` Greg KH
2011-04-06 18:25                           ` Andres Salomon
2011-04-06 18:38                             ` Greg KH
2011-04-07  8:04                               ` Grant Likely
2011-04-06 18:47                           ` Samuel Ortiz
2011-04-06 18:59                             ` Felipe Balbi
2011-04-06 22:09                               ` Greg KH
2011-04-07  8:09                                 ` Felipe Balbi
2011-04-07 13:40                               ` Samuel Ortiz
2011-04-07 14:35                                 ` Grant Likely
2011-04-07 15:03                                   ` Samuel Ortiz
2011-04-07 18:06                                     ` Grant Likely
2011-04-07 16:24                   ` Grant Likely
2011-04-01 18:26         ` Samuel Ortiz
2011-02-03  4:09 ` [PATCH 08/19] t7166xb: " Andres Salomon
2011-02-03  4:11 ` [PATCH 09/19] wl1273: " Andres Salomon
2011-02-03  4:12 ` [PATCH 10/19] sh_mobile_sdhi: " Andres Salomon
2011-02-03  4:13 ` [PATCH 11/19] tc6393xb: " Andres Salomon
2011-02-03  4:15 ` [PATCH 12/19] twl4030: " Andres Salomon
2011-02-03  6:05   ` Dmitry Torokhov
2011-02-03  6:39     ` Andres Salomon
2011-02-03  6:53       ` Dmitry Torokhov [this message]
2011-02-03  7:03         ` Andres Salomon
2011-02-03  9:31           ` Mark Brown
2011-02-05  2:39             ` Andres Salomon
2011-02-05  3:25               ` Andres Salomon
2011-02-03 12:23           ` Peter Ujfalusi
2011-02-04 10:41           ` Uwe Kleine-König
2011-02-03  4:16 ` [PATCH 13/19] tc6387xb: " Andres Salomon
2011-02-03  4:17 ` [PATCH 14/19] janz: " Andres Salomon
2011-02-03  4:20 ` [PATCH 15/19] mc13xxx: " Andres Salomon
2011-02-04  9:34   ` Uwe Kleine-König
2011-02-04 10:13     ` Uwe Kleine-König
2011-02-04 10:16     ` Andres Salomon
2011-02-03  4:21 ` [PATCH 16/19] mfd-core: drop platform_data/data_size from core mfd_cell struct Andres Salomon
2011-02-03  4:22 ` [PATCH 17/19] mfd-core: add refcounting support to mfd_cells Andres Salomon
2011-02-03  4:23 ` [PATCH 18/19] mfd-core: add platform_device sharing support for mfd Andres Salomon
2011-02-03  4:26 ` [PATCH 19/19] cs5535-mfd: add sharing for acpi/pms cells Andres Salomon

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