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From:   "Alastair D'Silva" <alastair@au1.ibm.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Donnellan <ajd@linux.ibm.com>
Cc:     "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
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        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
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        Krzysztof Kozlowski <krzk@kernel.org>,
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        =?ISO-8859-1?Q?C=E9dric?= Le Goater <clg@kaod.org>,
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        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
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Date:   Mon, 02 Mar 2020 16:38:45 +1100
In-Reply-To: <4075f48568fee61123579d4edea0e7939b4b2e6c.camel@au1.ibm.com>
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         <96687fbf-38ab-13ff-ca19-ccb67bbc4405@linux.ibm.com>
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         <4075f48568fee61123579d4edea0e7939b4b2e6c.camel@au1.ibm.com>
Organization: IBM Australia
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Subject: RE: [PATCH v3 25/27] powerpc/powernv/pmem: Expose the serial number in
 sysfs
Sender: linux-kernel-owner@vger.kernel.org
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On Mon, 2020-03-02 at 10:42 +1100, Alastair D'Silva wrote:
> On Fri, 2020-02-28 at 08:15 +0100, Greg Kroah-Hartman wrote:
> > On Fri, Feb 28, 2020 at 05:25:31PM +1100, Andrew Donnellan wrote:
> > > On 21/2/20 2:27 pm, Alastair D'Silva wrote:
> > > > +int ocxlpmem_sysfs_add(struct ocxlpmem *ocxlpmem)
> > > > +{
> > > > +	int i, rc;
> > > > +
> > > > +	for (i = 0; i < ARRAY_SIZE(attrs); i++) {
> > > > +		rc = device_create_file(&ocxlpmem->dev,
> > > > &attrs[i]);
> > > > +		if (rc) {
> > > > +			for (; --i >= 0;)
> > > > +				device_remove_file(&ocxlpmem-
> > > > >dev,
> > > > &attrs[i]);
> > > 
> > > I'd rather avoid weird for loop constructs if possible.
> > > 
> > > Is it actually dangerous to call device_remove_file() on an attr
> > > that hasn't
> > > been added? If not then I'd rather define an err: label and loop
> > > over the
> > > whole array there.
> > 
> > None of this should be used at all, just use attribute groups
> > properly
> > and the driver core will handle this all for you.
> > 
> > device_create/remove_file should never be called by anyone anymore
> > if
> > at all
> > possible.
> > 
> > thanks,
> > 
> > greg k-h
> 
> Thanks, I'll rework it to use the .groups member of struct
> pci_driver.
> 

I ended up making these available as DIMM attributes instead.

-- 
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819