linux-kernel - Re: [PATCH] Generic WorkQueue Engine (GenWQE) device driver (v4)

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Date:	Tue, 05 Nov 2013 08:16:24 +0100
From:	Frank Haverkamp <haver@...ux.vnet.ibm.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de,
	cody@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
	utz.bacher@...ibm.com, mmarek@...e.cz, rmallon@...il.com,
	jsvogt@...ibm.com, MIJUNG@...ibm.com, cascardo@...ux.vnet.ibm.com,
	michael@...ra.de, Frank Haverkamp <haver@...t.ibm.com>
Subject: Re: [PATCH] Generic WorkQueue Engine (GenWQE) device driver (v4)

Hi Greg,

Am Montag, den 04.11.2013, 14:15 -0800 schrieb Greg KH:
> > I am using sysfs_create_group() now, but do I understand you
> correctly
> > that setting the const struct attribute_group **groups; in my device
> > (where in my struct pci_device.dev?) is an even better way to
> establish
> > my sysfs attributes? Is there a function which I could call rather
> than
> > trying to find the right pointer?
> 
> Ugh, this is still a problem, I'm trying to work through how to have
> individual drivers implement groups and sysfs files in a non-racy way.
> The issue is your device was announced to userspace _before_ it was
> bound to the driver, so there's no way to get the sysfs files to apply
> before then.
> 
> You should just have the attributes on the sysfs device you create
> yourself, not your pci device, as that's where they make more sense,
> and
> there you should be able to use the attribute group easily, right?
> 

The current version works well for me and I did not get any complaints
about the possible race-condition you mentioned so far. So I am happy.

> thanks,
> 
> greg k-h

Greetings

Frank

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