linux-kernel - Re: [Linux-kernel-mentees] [PATCH] PCI/IOV: Move sysfs SR-IOV functions to iov.c

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Message-ID: <20190810171525.GG221706@google.com>
Date:   Sat, 10 Aug 2019 12:15:25 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Greg KH <greg@...ah.com>
Cc:     Kelsey Skunberg <skunberg.kelsey@...il.com>,
        linux-pci@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH] PCI/IOV: Move sysfs SR-IOV
 functions to iov.c

On Sat, Aug 10, 2019 at 09:17:19AM +0200, Greg KH wrote:
> On Fri, Aug 09, 2019 at 01:57:21PM -0600, Kelsey Skunberg wrote:
> > +static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
> 
> DEVICE_ATTR_RO() please.  This is a device attribute, not a "raw"
> kobject attribute.

This patch is just a move; here's the source of the line above:

> > -static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);

I certainly support using DEVICE_ATTR_RO() instead of __ATTR_RO(), but
that should be down with a separate patch so it's not buried in what
is otherwise a simple move.

> > +static struct device_attribute sriov_numvfs_attr =
> > +		__ATTR(sriov_numvfs, (S_IRUGO | S_IWUSR | S_IWGRP),
> > +		       sriov_numvfs_show, sriov_numvfs_store);
> > +static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
> > +static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
> > +static struct device_attribute sriov_vf_device_attr =
> > +		__ATTR_RO(sriov_vf_device);
> > +static struct device_attribute sriov_drivers_autoprobe_attr =
> > +		__ATTR(sriov_drivers_autoprobe, (S_IRUGO | S_IWUSR | S_IWGRP),
> > +		       sriov_drivers_autoprobe_show,
> > +		       sriov_drivers_autoprobe_store);
> 
> Same for all of these, they should use DEVICE_ATTR* macros.
> 
> And why the odd permissions on 2 of these files?  Are you sure about
> that?

Same for these.  It'd be nice to fix them (and similar cases in
pci-sysfs.c, rpadlpar_sysfs.c, sgi_hotplug.c, slot.c) but in a
separate patch.

I think Kelsey did the right thing here by not mixing unrelated fixes
in with the code move.  A couple additional patches to change the
__ATTR() uses and the permissions (git grep "\<S_" finds several
possibilities) would be icing on the cake, but getting the SR-IOV
code all together is an improvement by itself.

Bjorn