On Mon, Mar 11, 2013 at 10:43:58AM +0800, Wanlong Gao wrote:
> From: Paolo Bonzini <pbonz...@redhat.com>
>
> virtio_scsi_target_state is now empty, but we will find new uses
> for it in the next few patches. However, dropping the sglist lets
> us turn the array-of-pointers into a simple array, which simplifies
> the allocation.
>
> However, we do not leave the virtio_scsi_target_state structs in the
> flexible array member at the end of struct virtio_scsi, because
> we will place the virtqueues there in the next patches.
>
> Cc: linux-scsi@vger.kernel.org
> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
> Signed-off-by: Wanlong Gao <gaowanl...@cn.fujitsu.com>
> ---
> drivers/scsi/virtio_scsi.c | 45 ++++++++++++---------------------------------
> 1 file changed, 12 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
> index 6307099..75ccde1 100644
> --- a/drivers/scsi/virtio_scsi.c
> +++ b/drivers/scsi/virtio_scsi.c
> @@ -76,7 +76,7 @@ struct virtio_scsi {
> /* Get some buffers ready for event vq */
> struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN];
>
> - struct virtio_scsi_target_state *tgt[];
> + struct virtio_scsi_target_state *tgt;
> };
>
> static struct kmem_cache *virtscsi_cmd_cache;
> @@ -568,18 +568,9 @@ static void virtscsi_init_vq(struct virtio_scsi_vq
> *virtscsi_vq,
> virtscsi_vq->vq = vq;
> }
>
> -static struct virtio_scsi_target_state *virtscsi_alloc_tgt(
> - struct virtio_device *vdev, int sg_elems)
> +static void virtscsi_init_tgt(struct virtio_scsi_target_state *tgt)
> {
> - struct virtio_scsi_target_state *tgt;
> - gfp_t gfp_mask = GFP_KERNEL;
> -
> - tgt = kmalloc(sizeof(*tgt), gfp_mask);
> - if (!tgt)
> - return NULL;
> -
> spin_lock_init(&tgt->tgt_lock);
> - return tgt;
> }
>
> static void virtscsi_scan(struct virtio_device *vdev)
> @@ -593,17 +584,10 @@ static void virtscsi_remove_vqs(struct virtio_device
> *vdev)
> {
> struct Scsi_Host *sh = virtio_scsi_host(vdev);
> struct virtio_scsi *vscsi = shost_priv(sh);
> - u32 i, num_targets;
>
> /* Stop all the virtqueues. */
> vdev->config->reset(vdev);
> -
> - num_targets = sh->max_id;
> - for (i = 0; i < num_targets; i++) {
> - kfree(vscsi->tgt[i]);
> - vscsi->tgt[i] = NULL;
> - }
> -
> + kfree(vscsi->tgt);
> vdev->config->del_vqs(vdev);
> }
>
> @@ -612,7 +596,7 @@ static int virtscsi_init(struct virtio_device *vdev,
> {
> int err;
> struct virtqueue *vqs[3];
> - u32 i, sg_elems;
> + u32 i;
>
> vq_callback_t *callbacks[] = {
> virtscsi_ctrl_done,
> @@ -640,16 +624,14 @@ static int virtscsi_init(struct virtio_device *vdev,
> if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
> virtscsi_kick_event_all(vscsi);
>
> - /* We need to know how many segments before we allocate. */
> - sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
The drop of sg_elems does not belong to this patch. It should be done in
'virtio-scsi: use virtqueue_add_sgs for command buffers'.
> - for (i = 0; i < num_targets; i++) {
> - vscsi->tgt[i] = virtscsi_alloc_tgt(vdev, sg_elems);
> - if (!vscsi->tgt[i]) {
> - err = -ENOMEM;
> - goto out;
> - }
> + vscsi->tgt = kmalloc(num_targets * sizeof(vscsi->tgt[0]), GFP_KERNEL);
> + if (!vscsi->tgt) {
> + err = -ENOMEM;
> + goto out;
> }
> + for (i = 0; i < num_targets; i++)
> + virtscsi_init_tgt(&vscsi->tgt[i]);
> +
> err = 0;
>
> out:
> @@ -668,10 +650,7 @@ static int virtscsi_probe(struct virtio_device *vdev)
>
> /* Allocate memory and link the structs together. */
> num_targets = virtscsi_config_get(vdev, max_target) + 1;
> - shost = scsi_host_alloc(&virtscsi_host_template,
> - sizeof(*vscsi)
> - + num_targets * sizeof(struct virtio_scsi_target_state));
> -
> + shost = scsi_host_alloc(&virtscsi_host_template, sizeof(*vscsi));
> if (!shost)
> return -ENOMEM;
>
> --
> 1.8.2.rc2
>
--
Asias
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