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authorAsias He <asias@redhat.com>2013-05-07 14:54:36 +0800
committerMichael S. Tsirkin <mst@redhat.com>2013-07-11 15:38:40 +0300
commit22fa90c7fb479694d6affebc049d21f06b714be6 (patch)
treefd62ad11e27171f38d29470e5935736d835d3a4c
parente7802212ea4bbbd5db99181942a19ab36ca4b914 (diff)
vhost: Remove custom vhost rcu usage
Now, vq->private_data is always accessed under vq mutex. No need to play the vhost rcu trick. Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
-rw-r--r--drivers/vhost/net.c16
-rw-r--r--drivers/vhost/scsi.c6
-rw-r--r--drivers/vhost/test.c6
-rw-r--r--drivers/vhost/vhost.h10
4 files changed, 12 insertions, 26 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 99f8d63491aa..969a85960e9f 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -15,7 +15,6 @@
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
-#include <linux/rcupdate.h>
#include <linux/file.h>
#include <linux/slab.h>
@@ -749,8 +748,7 @@ static int vhost_net_enable_vq(struct vhost_net *n,
struct vhost_poll *poll = n->poll + (nvq - n->vqs);
struct socket *sock;
- sock = rcu_dereference_protected(vq->private_data,
- lockdep_is_held(&vq->mutex));
+ sock = vq->private_data;
if (!sock)
return 0;
@@ -763,10 +761,9 @@ static struct socket *vhost_net_stop_vq(struct vhost_net *n,
struct socket *sock;
mutex_lock(&vq->mutex);
- sock = rcu_dereference_protected(vq->private_data,
- lockdep_is_held(&vq->mutex));
+ sock = vq->private_data;
vhost_net_disable_vq(n, vq);
- rcu_assign_pointer(vq->private_data, NULL);
+ vq->private_data = NULL;
mutex_unlock(&vq->mutex);
return sock;
}
@@ -922,8 +919,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
}
/* start polling new socket */
- oldsock = rcu_dereference_protected(vq->private_data,
- lockdep_is_held(&vq->mutex));
+ oldsock = vq->private_data;
if (sock != oldsock) {
ubufs = vhost_net_ubuf_alloc(vq,
sock && vhost_sock_zcopy(sock));
@@ -933,7 +929,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
}
vhost_net_disable_vq(n, vq);
- rcu_assign_pointer(vq->private_data, sock);
+ vq->private_data = sock;
r = vhost_init_used(vq);
if (r)
goto err_used;
@@ -967,7 +963,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
return 0;
err_used:
- rcu_assign_pointer(vq->private_data, oldsock);
+ vq->private_data = oldsock;
vhost_net_enable_vq(n, vq);
if (ubufs)
vhost_net_ubuf_put_wait_and_free(ubufs);
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 45365396dbbc..35ab0ce98414 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1223,9 +1223,8 @@ vhost_scsi_set_endpoint(struct vhost_scsi *vs,
sizeof(vs->vs_vhost_wwpn));
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
vq = &vs->vqs[i].vq;
- /* Flushing the vhost_work acts as synchronize_rcu */
mutex_lock(&vq->mutex);
- rcu_assign_pointer(vq->private_data, vs_tpg);
+ vq->private_data = vs_tpg;
vhost_init_used(vq);
mutex_unlock(&vq->mutex);
}
@@ -1304,9 +1303,8 @@ vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
if (match) {
for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
vq = &vs->vqs[i].vq;
- /* Flushing the vhost_work acts as synchronize_rcu */
mutex_lock(&vq->mutex);
- rcu_assign_pointer(vq->private_data, NULL);
+ vq->private_data = NULL;
mutex_unlock(&vq->mutex);
}
}
diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index a73ea217f24d..339eae85859a 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -13,7 +13,6 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
-#include <linux/rcupdate.h>
#include <linux/file.h>
#include <linux/slab.h>
@@ -200,9 +199,8 @@ static long vhost_test_run(struct vhost_test *n, int test)
priv = test ? n : NULL;
/* start polling new socket */
- oldpriv = rcu_dereference_protected(vq->private_data,
- lockdep_is_held(&vq->mutex));
- rcu_assign_pointer(vq->private_data, priv);
+ oldpriv = vq->private_data;
+ vq->private_data = priv;
r = vhost_init_used(&n->vqs[index]);
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 42298cd23c73..4465ed5f316d 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -103,14 +103,8 @@ struct vhost_virtqueue {
struct iovec iov[UIO_MAXIOV];
struct iovec *indirect;
struct vring_used_elem *heads;
- /* We use a kind of RCU to access private pointer.
- * All readers access it from worker, which makes it possible to
- * flush the vhost_work instead of synchronize_rcu. Therefore readers do
- * not need to call rcu_read_lock/rcu_read_unlock: the beginning of
- * vhost_work execution acts instead of rcu_read_lock() and the end of
- * vhost_work execution acts instead of rcu_read_unlock().
- * Writers use virtqueue mutex. */
- void __rcu *private_data;
+ /* Protected by virtqueue mutex. */
+ void *private_data;
/* Log write descriptors */
void __user *log_base;
struct vhost_log *log;