Re: [PATCH v2 02/10] PCI/P2PDMA: Add sysfs group to display p2pmem stats

[Logan Gunthorpe]

On 01/03/18 05:36 PM, Dan Williams wrote:
> On Thu, Mar 1, 2018 at 4:15 PM, Logan Gunthorpe <logang@xxxxxxxxxxxx> wrote:
> > On 01/03/18 10:44 AM, Bjorn Helgaas wrote:
> > > I think these two statements are out of order, since the attributes
> > > dereference pdev->p2pdma.  And it looks like you set "error"
> > > unnecessarily, since you return immediately looking at it.
> >
> >
> > Per the previous series, sysfs_create_group is must_check for some reason. I
> > had a printk there but you didn't think it was necessary. So assigning it to
> > error is the only way to squash the warning.
>
> Why not fail the setup if the sysfs_create_group() fails? Sure, it may
> not be strictly required for userspace to have access to these
> attributes, but it seems hostile that userspace can't make assumptions
> about the presence of the "p2pmem" directory relative to the
> capability being setup.

Works for me. I'll do that.

Thanks,

Logan