We will place the request virtqueues in the flexible array member.
Refining the virtqueue API would let us drop the sglist copy, at
which point the pointer-to-array-of-pointers can become a simple
pointer-to-array. It would both simplify the allocation and remove a
dereference in several hot paths.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
drivers/scsi/virtio_scsi.c | 23 +++++++++++++++--------
1 files changed, 15 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 595af1a..62fec04 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -77,7 +77,7 @@ 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;
@@ -615,10 +615,13 @@ static void virtscsi_remove_vqs(struct virtio_device *vdev)
/* 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;
+ if (vscsi->tgt) {
+ 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);
@@ -660,6 +663,12 @@ static int virtscsi_init(struct virtio_device *vdev,
/* We need to know how many segments before we allocate. */
sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
+ vscsi->tgt = kmalloc(num_targets *
+ sizeof(struct virtio_scsi_target_state *), GFP_KERNEL);
+ if (!vscsi->tgt) {
+ err = -ENOMEM;
+ goto out;
+ }
for (i = 0; i < num_targets; i++) {
vscsi->tgt[i] = virtscsi_alloc_tgt(vdev, sg_elems);
if (!vscsi->tgt[i]) {
@@ -685,9 +694,7 @@ static int __devinit 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;
--
1.7.1
--
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