linux-kernel - Re: [PATCH v2 1/9] hwmon: Introduce hwmon_device_register_with

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Message-ID: <20130901180140.GA13735@kroah.com>
Date:	Sun, 1 Sep 2013 11:01:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean Delvare <khali@...ux-fr.org>, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/9] hwmon: Introduce hwmon_device_register_with_groups

On Sun, Sep 01, 2013 at 10:55:34AM -0700, Guenter Roeck wrote:
> On 09/01/2013 09:24 AM, Greg Kroah-Hartman wrote:
> >This looks good, just one minor question about the
> >non-driver-core-related code:
> >
> >>+struct device *
> >>+hwmon_device_register_with_groups(struct device *dev, const char *name,
> >>+				  void *drvdata,
> >>+				  const struct attribute_group **groups)
> >>  {
> >>-	struct device *hwdev;
> >>-	int id;
> >>+	struct hwmon_device *hwdev;
> >>+	int err, id;
> >>
> >>  	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
> >>  	if (id < 0)
> >>  		return ERR_PTR(id);
> >
> >Don't you need a lock around the ida_simple_get call to ensure hwmon_ida
> >is not being used at the same time twice?  Or does the ida framework
> >handle that ok?
> >
> 
> ida_simple_get handles the locking as far as I can see. Other callers don't use
> local locks either, so I guess it must be working.

Ok, nevermind then, nice work.

greg k-h
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