diff options
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vhost.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 78987e481bc6..1c05e6030d42 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -593,6 +593,7 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m) { struct vhost_memory mem, *newmem, *oldmem; unsigned long size = offsetof(struct vhost_memory, regions); + int i; if (copy_from_user(&mem, m, size)) return -EFAULT; @@ -619,7 +620,14 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m) oldmem = rcu_dereference_protected(d->memory, lockdep_is_held(&d->mutex)); rcu_assign_pointer(d->memory, newmem); - synchronize_rcu(); + + /* All memory accesses are done under some VQ mutex. + * So below is a faster equivalent of synchronize_rcu() + */ + for (i = 0; i < d->nvqs; ++i) { + mutex_lock(&d->vqs[i]->mutex); + mutex_unlock(&d->vqs[i]->mutex); + } kfree(oldmem); return 0; } |