From: grant.likely@secretlab.ca (Grant Likely)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/9] regulator: helper routine to extract regulator_init_data
Date: Tue, 4 Oct 2011 17:48:05 -0600 [thread overview]
Message-ID: <20111004234805.GJ3009@ponder.secretlab.ca> (raw)
In-Reply-To: <20111004230127.GB32102@n2100.arm.linux.org.uk>
On Wed, Oct 05, 2011 at 12:01:27AM +0100, Russell King - ARM Linux wrote:
> On Tue, Sep 27, 2011 at 01:10:04PM +0100, Mark Brown wrote:
> > On Tue, Sep 27, 2011 at 03:42:45PM +0530, Rajendra Nayak wrote:
> >
> > > + init_data = devm_kzalloc(dev, sizeof(struct regulator_init_data),
> > > + GFP_KERNEL);
> > > + if (!init_data)
> > > + return NULL; /* Out of memory? */
> >
> > This means that the init data will be kept around for the entire
> > lifetime of the device rather than being discarded.
>
> May I remind you that devm_* lifetime expires whenever the associated
> driver is unbound, which can be much shorter than the lifetime of the
> struct device.
>
> It expires when any of the following occurs:
> 1. userspace asks the associated driver to be unbound
> 2. the driver is removed
> 3. any driver probe for this struct device fails
> 4. the struct device is unregistered.
>
> So: don't use devm_* for anything other than stuff inside a driver being
> associated with the struct device itself. Other uses are a bug waiting
> to happen.
Yes, Russell is right. There were a number of places where I
suggested using devm_* in entirely the wrong places. Double check
anyplace where you've added devm_ calls.
g.
next prev parent reply other threads:[~2011-10-04 23:48 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-27 10:12 [PATCH 0/9] Device tree support for regulators Rajendra Nayak
2011-09-27 10:12 ` [PATCH 1/9] regulator: twl: Remove hardcoded board constraints from driver Rajendra Nayak
2011-09-27 11:37 ` Mark Brown
2011-09-27 14:47 ` Rajendra Nayak
2011-09-27 10:12 ` [PATCH 2/9] regulator: helper routine to extract regulator_init_data Rajendra Nayak
2011-09-27 12:10 ` Mark Brown
2011-09-27 14:48 ` Rajendra Nayak
2011-09-27 15:05 ` Mark Brown
2011-09-28 8:06 ` Cousson, Benoit
2011-09-30 4:27 ` Rajendra Nayak
2011-09-30 7:58 ` Cousson, Benoit
2011-09-30 10:49 ` Mark Brown
2011-09-30 10:28 ` Mark Brown
2011-09-30 10:48 ` Mark Brown
2011-09-30 11:09 ` Rajendra Nayak
2011-09-30 11:35 ` Cousson, Benoit
2011-09-30 12:18 ` Mark Brown
2011-10-04 5:28 ` Rajendra Nayak
2011-10-04 10:18 ` Mark Brown
2011-10-04 11:40 ` Rajendra Nayak
2011-10-04 11:51 ` Mark Brown
2011-10-04 12:02 ` Rajendra Nayak
2011-10-04 12:11 ` Mark Brown
2011-10-04 12:40 ` Nayak, Rajendra
2011-09-30 1:24 ` Grant Likely
2011-10-04 23:01 ` Russell King - ARM Linux
2011-10-04 23:48 ` Grant Likely [this message]
2011-09-27 10:12 ` [PATCH 3/9] omap4: sdp: Pass regulator data from dt Rajendra Nayak
2011-09-27 10:12 ` [PATCH 4/9] regulator: twl: Make twl-regulator driver extract data from DT Rajendra Nayak
2011-09-27 12:14 ` Mark Brown
2011-09-27 14:48 ` Rajendra Nayak
2011-09-27 10:12 ` [PATCH 5/9] regulator: helper routine to extract fixed_voltage_config Rajendra Nayak
2011-09-27 12:16 ` Mark Brown
2011-09-27 14:49 ` Rajendra Nayak
2011-09-27 16:13 ` Mark Brown
2011-09-30 1:26 ` Grant Likely
2011-09-27 10:12 ` [PATCH 6/9] regulator: make fixed regulator driver extract data from dt Rajendra Nayak
2011-09-30 1:34 ` Grant Likely
2011-09-27 10:12 ` [PATCH 7/9] omap4: panda: Pass regulator data from DT Rajendra Nayak
2011-09-27 10:12 ` [PATCH 8/9] regulator: helper to extract regulator node based on supply name Rajendra Nayak
2011-09-27 12:21 ` Mark Brown
2011-09-27 14:49 ` Rajendra Nayak
2011-09-27 18:59 ` Mark Brown
2011-09-28 8:09 ` Cousson, Benoit
2011-09-28 8:18 ` Rajendra Nayak
2011-09-28 12:26 ` Mark Brown
2011-09-30 9:34 ` Rajendra Nayak
2011-09-30 10:35 ` Mark Brown
2011-10-04 17:00 ` Grant Likely
2011-09-28 10:56 ` Rajendra Nayak
2011-09-30 1:36 ` Grant Likely
2011-09-27 10:12 ` [PATCH 9/9] regulator: map consumer regulator based on device tree Rajendra Nayak
2011-09-27 12:23 ` Mark Brown
2011-09-27 14:49 ` Rajendra Nayak
2011-09-30 1:38 ` Grant Likely
2011-09-30 9:29 ` Rajendra Nayak
2011-09-30 1:39 ` [PATCH 0/9] Device tree support for regulators Grant Likely
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