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| author | Michael S. Tsirkin | 2014-06-05 14:20:27 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin | 2014-06-09 15:21:07 +0200 |
| commit | 47283bef7ed356629467d1fac61687756e48f254 (patch) | |
| tree | 464f8f6973cf9da00fc57679a62638a6c7aee593 /drivers/vhost/scsi.c | |
| parent | vhost: move acked_features to VQs (diff) | |
| download | kernel-qcow2-linux-47283bef7ed356629467d1fac61687756e48f254.tar.gz kernel-qcow2-linux-47283bef7ed356629467d1fac61687756e48f254.tar.xz kernel-qcow2-linux-47283bef7ed356629467d1fac61687756e48f254.zip | |
vhost: move memory pointer to VQs
commit 2ae76693b8bcabf370b981cd00c36cd41d33fabc
vhost: replace rcu with mutex
replaced rcu sync for memory accesses with VQ mutex locl/unlock.
This is correct since all accesses are under VQ mutex, but incomplete:
we still do useless rcu lock/unlock operations, someone might copy this
code into some other context where this won't be right.
This use of RCU is also non standard and hard to understand.
Let's copy the pointer to each VQ structure, this way
the access rules become straight-forward, and there's
no need for RCU anymore.
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/scsi.c')
| -rw-r--r-- | drivers/vhost/scsi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index f1f284fe30fd..83b834b357d9 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -606,7 +606,7 @@ tcm_vhost_do_evt_work(struct vhost_scsi *vs, struct tcm_vhost_evt *evt) again: vhost_disable_notify(&vs->dev, vq); - head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, + head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), &out, &in, NULL, NULL); if (head < 0) { @@ -945,7 +945,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) vhost_disable_notify(&vs->dev, vq); for (;;) { - head = vhost_get_vq_desc(&vs->dev, vq, vq->iov, + head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), &out, &in, NULL, NULL); pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |