linux-kernel - Re: [PATCH] Introduce {sysfs,device}_create_file

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Date:	Wed, 12 May 2010 11:38:06 -0700
From:	Greg KH <gregkh@...e.de>
To:	Anton Vorontsov <cbouatmailru@...il.com>
Cc:	Daniel Mack <daniel@...aq.de>, linux-kernel@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Len Brown <len.brown@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Matt Reimer <mreimer@...p.net>,
	Evgeniy Polyakov <zbr@...emap.net>, Tejun Heo <tj@...nel.org>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH] Introduce {sysfs,device}_create_file_mode

On Wed, May 12, 2010 at 10:15:46PM +0400, Anton Vorontsov wrote:
> We need to create attributes with different modes across devices.
> We can do this by modifying attr.mode between device_create_file
> invocations, but that is racy in case of globally defined attrs.
> 
> Luckily, there's sysfs_add_file_mode() function that seems to do
> exactly what we want, and if we use it, we don't need any locks
> to avoid races. Though, it isn't exposed via device-drivers core
> API.

But you race the creation of the device notifying userspace, and then
the file being created, right?  Or is that properly taken care of
elsewhere?

> Greg, does the patch look OK? If so, I'd like it to go
> via battery-2.6.git tree, along with patches that need
> that one.

Looks good with one minor problem:

> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -440,6 +440,27 @@ struct kset *devices_kset;
>   * device_create_file - create sysfs attribute file for device.

That should be "device_create_file_mode"

Make that change and then feel free to take it through your tree with
an:
	Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
on it.

thanks,

greg k-h
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