From: Mark Brown <broonie@kernel.org>
To: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Stephen Warren <swarren@wwwdotorg.org>,
Javier Martinez Canillas <javier@osg.samsung.com>,
Thierry Reding <thierry.reding@gmail.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
linux-acpi@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Frank Rowand <frowand.list@gmail.com>,
Grant Likely <grant.likely@linaro.org>,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [PATCH v4 04/22] of: add function to allow probing a device from a OF node
Date: Wed, 16 Sep 2015 20:35:19 +0100 [thread overview]
Message-ID: <20150916193519.GO12027@sirena.org.uk> (raw)
In-Reply-To: <CAAObsKBihtEeNN_NyTmB+U9NAJV6UmJ5LJrqBbO7h9KZPPh8LQ@mail.gmail.com>
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On Wed, Sep 16, 2015 at 10:17:43AM +0200, Tomeu Vizoso wrote:
> AFAICS, this is a must currently for correct operation in simple-bus
> and simple-mfd situations, because probing order is currently very
> unpredictable and it's totally possible for the probing of a child to
> start before the probing of its parent has finished (if async probing
> is enabled or if a module is loaded that registers a child's driver at
> the wrong time).
Hrm. That's worrying for devices that rely on peering into their parent
device for things...
> I would prefer if the core would take care of making sure that parents
> are always probed before their children, but the unconditional locking
> of the parent device stands in the way.
In the MFD case this is another reason for not putting the device
structure into the DT - if it isn't then the ordering is controlled by
the device being instantiated.
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next prev parent reply other threads:[~2015-09-16 19:35 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-07 12:23 [PATCH v4 0/22] On-demand device probing Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 01/22] driver core: Add pre_probe callback to bus_type Tomeu Vizoso
2015-09-11 12:04 ` Mark Brown
2015-09-07 12:23 ` [PATCH v4 02/22] ARM: amba: Move reading of periphid to pre_probe() Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 03/22] of/platform: Point to struct device from device node Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 04/22] of: add function to allow probing a device from a OF node Tomeu Vizoso
2015-09-09 1:29 ` Rob Herring
2015-09-10 14:53 ` Tomeu Vizoso
2015-09-11 12:08 ` Mark Brown
2015-09-16 8:17 ` Tomeu Vizoso
2015-09-16 19:35 ` Mark Brown [this message]
2015-10-21 11:29 ` Geert Uytterhoeven
2015-09-07 12:23 ` [PATCH v4 05/22] gpio: Probe GPIO drivers on demand Tomeu Vizoso
2015-09-25 17:01 ` Linus Walleij
2015-09-07 12:23 ` [PATCH v4 06/22] gpio: Probe pinctrl devices " Tomeu Vizoso
2015-09-25 17:02 ` Linus Walleij
2015-09-07 12:23 ` [PATCH v4 07/22] regulator: core: Reduce critical area in _regulator_get Tomeu Vizoso
2015-09-11 12:10 ` Mark Brown
2015-09-07 12:23 ` [PATCH v4 08/22] regulator: core: Probe regulators on demand Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 09/22] drm: Probe panels " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 10/22] drm/tegra: Probe dpaux devices " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 11/22] i2c: core: Probe i2c adapters and " Tomeu Vizoso
2015-10-20 10:42 ` Wolfram Sang
2015-09-07 12:23 ` [PATCH v4 12/22] pwm: Probe PWM chip " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 13/22] backlight: Probe backlight " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 14/22] usb: phy: Probe phy " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 15/22] clk: Probe clk providers " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 16/22] pinctrl: Probe pinctrl devices " Tomeu Vizoso
2015-09-25 17:03 ` Linus Walleij
2015-09-07 12:23 ` [PATCH v4 17/22] phy: core: Probe phy providers " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 18/22] dma: of: Probe DMA controllers " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 19/22] power-supply: Probe power supplies " Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 20/22] driver core: Allow deferring probes until late init Tomeu Vizoso
2015-09-11 12:17 ` Mark Brown
2015-09-14 9:04 ` Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 21/22] driver core: Start processing deferred probes earlier Tomeu Vizoso
2015-09-11 12:24 ` Mark Brown
2015-09-15 13:16 ` Tomeu Vizoso
2015-09-07 12:23 ` [PATCH v4 22/22] of/platform: Defer probes of registered devices Tomeu Vizoso
2015-09-07 20:50 ` [PATCH v4 0/22] On-demand device probing Rob Herring
2015-09-08 7:30 ` Tomeu Vizoso
2015-09-09 1:33 ` Rob Herring
2015-09-09 9:40 ` Tomeu Vizoso
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