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.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
v1->v2: new
drivers/scsi/virtio_scsi.c | 43 ++++++++++++++-----------------------------
1 files changed, 14 insertions(+), 29 deletions(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 2b93b6e..4a3abaf 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -74,7 +74,7 @@ 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;
@@ -426,7 +426,7 @@ static int virtscsi_kick_cmd(struct
virtio_scsi_target_state *tgt,
static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
{
struct virtio_scsi *vscsi = shost_priv(sh);
- struct virtio_scsi_target_state *tgt = vscsi->tgt[sc->device->id];
+ struct virtio_scsi_target_state *tgt = &vscsi->tgt[sc->device->id];
struct virtio_scsi_cmd *cmd;
int ret;
@@ -474,7 +474,7 @@ out:
static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
{
DECLARE_COMPLETION_ONSTACK(comp);
- struct virtio_scsi_target_state *tgt = vscsi->tgt[cmd->sc->device->id];
+ struct virtio_scsi_target_state *tgt = &vscsi->tgt[cmd->sc->device->id];
int ret = FAILED;
cmd->comp = ∁
@@ -578,19 +578,9 @@ 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;
-
- /* We need extra sg elements at head and tail. */
- 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)
@@ -604,16 +594,12 @@ 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);
+ vscsi->tgt = NULL;
vdev->config->del_vqs(vdev);
}
@@ -654,13 +640,14 @@ 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;
- 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:
@@ -679,9 +666,7 @@ 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
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
