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From: Pankaj Gupta <pagupta@redhat.com>
To: "Jakub Staroń" <jstaron@google.com>
Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org,
	qemu-devel@nongnu.org, linux-ext4@vger.kernel.org,
	linux-xfs@vger.kernel.org, jack@suse.cz, mst@redhat.com,
	jasowang@redhat.com, david@fromorbit.com, lcapitulino@redhat.com,
	adilger kernel <adilger.kernel@dilger.ca>,
	zwisler@kernel.org, aarcange@redhat.com,
	dave jiang <dave.jiang@intel.com>,
	darrick wong <darrick.wong@oracle.com>,
	vishal l verma <vishal.l.verma@intel.com>,
	david@redhat.com, willy@infradead.org, hch@infradead.org,
	jmoyer@redhat.com, nilal@redhat.com, lenb@kernel.org,
	kilobyte@angband.pl, riel@surriel.com,
	yuval shaia <yuval.shaia@oracle.com>,
	stefanha@redhat.com, pbonzini@redhat.com,
	dan j williams <dan.j.williams@intel.com>,
	kwolf@redhat.com, tytso@mit.edu,
	xiaoguangrong eric <xiaoguangrong.eric@gmail.com>,
	cohuck@redhat.com, rjw@rjwysocki.net, imammedo@redhat.com,
	smbarber@google.com
Subject: Re: [Qemu-devel] [PATCH v7 2/6] virtio-pmem: Add virtio pmem driver
Date: Wed, 8 May 2019 11:23:32 -0400 (EDT)	[thread overview]
Message-ID: <1482604497.27348783.1557329012320.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <1555943483.27247564.1557313967518.JavaMail.zimbra@redhat.com>


> > 
> > > +int virtio_pmem_flush(struct nd_region *nd_region)
> > > +{
> > > +        int err;
> > > +        unsigned long flags;
> > > +        struct scatterlist *sgs[2], sg, ret;
> > > +        struct virtio_device *vdev = nd_region->provider_data;
> > > +        struct virtio_pmem *vpmem = vdev->priv;
> > > +        struct virtio_pmem_request *req;
> > > +
> > > +        might_sleep();
> > > +        req = kmalloc(sizeof(*req), GFP_KERNEL);
> > > +        if (!req)
> > > +                return -ENOMEM;
> > > +
> > > +        req->done = req->wq_buf_avail = false;
> > > +        strcpy(req->name, "FLUSH");
> > > +        init_waitqueue_head(&req->host_acked);
> > > +        init_waitqueue_head(&req->wq_buf);
> > > +        sg_init_one(&sg, req->name, strlen(req->name));
> > > +        sgs[0] = &sg;
> > > +        sg_init_one(&ret, &req->ret, sizeof(req->ret));
> > > +        sgs[1] = &ret;
> > > +
> > > +        spin_lock_irqsave(&vpmem->pmem_lock, flags);
> > > +        err = virtqueue_add_sgs(vpmem->req_vq, sgs, 1, 1, req, GFP_ATOMIC);
> > > +        if (err) {
> > > +                dev_err(&vdev->dev, "failed to send command to virtio pmem device\n");
> > > +
> > > +                list_add_tail(&vpmem->req_list, &req->list);
> > > +                spin_unlock_irqrestore(&vpmem->pmem_lock, flags);
> > > +
> > > +                /* When host has read buffer, this completes via host_ack */
> > > +                wait_event(req->wq_buf, req->wq_buf_avail);
> > > +                spin_lock_irqsave(&vpmem->pmem_lock, flags);
> > > +        }
> > 
> > Aren't the arguments in `list_add_tail` swapped? The element we are adding
> 

Yes, arguments for 'list_add_tail' should be swapped.

list_add_tail(&req->list, &vpmem->req_list);


Thank you,
Pankaj

  reply	other threads:[~2019-05-08 15:23 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-26  5:00 [PATCH v7 0/6] " Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 1/6] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 2/6] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-04-30  5:53   ` [Qemu-devel] " Yuval Shaia
2019-04-30  6:06     ` Pankaj Gupta
2019-05-07 15:35   ` Dan Williams
2019-05-08 11:19     ` [Qemu-devel] " Pankaj Gupta
2019-05-10 23:33       ` Dan Williams
2019-05-11  1:26         ` Pankaj Gupta
2019-05-07 20:25   ` Jakub Staroń
2019-05-08 11:12     ` Pankaj Gupta
2019-05-08 15:23       ` Pankaj Gupta [this message]
2019-05-08 19:05       ` Jakub Staroń
2019-04-26  5:00 ` [PATCH v7 3/6] libnvdimm: add dax_dev sync flag Pankaj Gupta
2019-05-07 15:40   ` Dan Williams
2019-05-09 12:24     ` Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 4/6] dax: check synchronous mapping is supported Pankaj Gupta
2019-05-07 19:24   ` [Qemu-devel] " Jakub Staroń
2019-05-08  5:31     ` Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 5/6] ext4: disable map_sync for async flush Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 6/6] xfs: " Pankaj Gupta
2019-05-07 15:37   ` Dan Williams
2019-05-07 16:17     ` Darrick J. Wong
2019-05-08  5:49       ` [Qemu-devel] " Pankaj Gupta

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