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

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Date:   Thu, 1 Mar 2018 17:15:51 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH v2 02/10] PCI/P2PDMA: Add sysfs group to display p2pmem
 stats



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.

Logan