tcp: enforce tcp_min_snd_mss in tcp_mtu_probing()

[pandora-kernel.git] / drivers / xen / gntdev.c

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index afca14d..5027662 100644 (file)
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -60,7 +60,7 @@ static int use_ptemod;
 struct gntdev_priv {
        struct list_head maps;
        /* lock protects maps from concurrent changes */
-       spinlock_t lock;
+       struct mutex lock;
        struct mm_struct *mm;
        struct mmu_notifier mn;
 };
@@ -105,6 +105,21 @@ static void gntdev_print_maps(struct gntdev_priv *priv,
 #endif
 }
 
+static void gntdev_free_map(struct grant_map *map)
+{
+       if (map == NULL)
+               return;
+
+       if (map->pages)
+               free_xenballooned_pages(map->count, map->pages);
+       kfree(map->pages);
+       kfree(map->grants);
+       kfree(map->map_ops);
+       kfree(map->unmap_ops);
+       kfree(map->kmap_ops);
+       kfree(map);
+}
+
 static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
 {
        struct grant_map *add;
@@ -142,12 +157,7 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
        return add;
 
 err:
-       kfree(add->pages);
-       kfree(add->grants);
-       kfree(add->map_ops);
-       kfree(add->unmap_ops);
-       kfree(add->kmap_ops);
-       kfree(add);
+       gntdev_free_map(add);
        return NULL;
 }
 
@@ -196,17 +206,9 @@ static void gntdev_put_map(struct grant_map *map)
        if (map->notify.flags & UNMAP_NOTIFY_SEND_EVENT)
                notify_remote_via_evtchn(map->notify.event);
 
-       if (map->pages) {
-               if (!use_ptemod)
-                       unmap_grant_pages(map, 0, map->count);
-
-               free_xenballooned_pages(map->count, map->pages);
-       }
-       kfree(map->pages);
-       kfree(map->grants);
-       kfree(map->map_ops);
-       kfree(map->unmap_ops);
-       kfree(map);
+       if (map->pages && !use_ptemod)
+               unmap_grant_pages(map, 0, map->count);
+       gntdev_free_map(map);
 }
 
 /* ------------------------------------------------------------------ */
@@ -393,7 +395,7 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
        unsigned long mstart, mend;
        int err;
 
-       spin_lock(&priv->lock);
+       mutex_lock(&priv->lock);
        list_for_each_entry(map, &priv->maps, next) {
                if (!map->vma)
                        continue;
@@ -412,7 +414,7 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
                                        (mend - mstart) >> PAGE_SHIFT);
                WARN_ON(err);
        }
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
 }
 
 static void mn_invl_page(struct mmu_notifier *mn,
@@ -429,7 +431,7 @@ static void mn_release(struct mmu_notifier *mn,
        struct grant_map *map;
        int err;
 
-       spin_lock(&priv->lock);
+       mutex_lock(&priv->lock);
        list_for_each_entry(map, &priv->maps, next) {
                if (!map->vma)
                        continue;
@@ -439,7 +441,7 @@ static void mn_release(struct mmu_notifier *mn,
                err = unmap_grant_pages(map, /* offset */ 0, map->count);
                WARN_ON(err);
        }
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
 }
 
 struct mmu_notifier_ops gntdev_mmu_ops = {
@@ -460,7 +462,7 @@ static int gntdev_open(struct inode *inode, struct file *flip)
                return -ENOMEM;
 
        INIT_LIST_HEAD(&priv->maps);
-       spin_lock_init(&priv->lock);
+       mutex_init(&priv->lock);
 
        if (use_ptemod) {
                priv->mm = get_task_mm(current);
@@ -491,11 +493,13 @@ static int gntdev_release(struct inode *inode, struct file *flip)
 
        pr_debug("priv %p\n", priv);
 
+       mutex_lock(&priv->lock);
        while (!list_empty(&priv->maps)) {
                map = list_entry(priv->maps.next, struct grant_map, next);
                list_del(&map->next);
                gntdev_put_map(map);
        }
+       mutex_unlock(&priv->lock);
 
        if (use_ptemod)
                mmu_notifier_unregister(&priv->mn, priv->mm);
@@ -533,10 +537,10 @@ static long gntdev_ioctl_map_grant_ref(struct gntdev_priv *priv,
                return err;
        }
 
-       spin_lock(&priv->lock);
+       mutex_lock(&priv->lock);
        gntdev_add_map(priv, map);
        op.index = map->index << PAGE_SHIFT;
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
 
        if (copy_to_user(u, &op, sizeof(op)) != 0)
                return -EFAULT;
@@ -555,13 +559,13 @@ static long gntdev_ioctl_unmap_grant_ref(struct gntdev_priv *priv,
                return -EFAULT;
        pr_debug("priv %p, del %d+%d\n", priv, (int)op.index, (int)op.count);
 
-       spin_lock(&priv->lock);
+       mutex_lock(&priv->lock);
        map = gntdev_find_map_index(priv, op.index >> PAGE_SHIFT, op.count);
        if (map) {
                list_del(&map->next);
                err = 0;
        }
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
        if (map)
                gntdev_put_map(map);
        return err;
@@ -606,7 +610,7 @@ static long gntdev_ioctl_notify(struct gntdev_priv *priv, void __user *u)
        if (op.action & ~(UNMAP_NOTIFY_CLEAR_BYTE|UNMAP_NOTIFY_SEND_EVENT))
                return -EINVAL;
 
-       spin_lock(&priv->lock);
+       mutex_lock(&priv->lock);
 
        list_for_each_entry(map, &priv->maps, next) {
                uint64_t begin = map->index << PAGE_SHIFT;
@@ -629,7 +633,7 @@ static long gntdev_ioctl_notify(struct gntdev_priv *priv, void __user *u)
        map->notify.event = op.event_channel_port;
        rc = 0;
  unlock_out:
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
        return rc;
 }
 
@@ -674,7 +678,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
        pr_debug("map %d+%d at %lx (pgoff %lx)\n",
                        index, count, vma->vm_start, vma->vm_pgoff);
 
-       spin_lock(&priv->lock);
+       mutex_lock(&priv->lock);
        map = gntdev_find_map_index(priv, index, count);
        if (!map)
                goto unlock_out;
@@ -692,7 +696,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
        vma->vm_flags |= VM_RESERVED|VM_DONTEXPAND;
 
        if (use_ptemod)
-               vma->vm_flags |= VM_DONTCOPY|VM_PFNMAP;
+               vma->vm_flags |= VM_DONTCOPY;
 
        vma->vm_private_data = map;
 
@@ -709,7 +713,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
                        map->flags |= GNTMAP_readonly;
        }
 
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
 
        if (use_ptemod) {
                err = apply_to_page_range(vma->vm_mm, vma->vm_start,
@@ -737,11 +741,11 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
        return 0;
 
 unlock_out:
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
        return err;
 
 out_unlock_put:
-       spin_unlock(&priv->lock);
+       mutex_unlock(&priv->lock);
 out_put_map:
        if (use_ptemod)
                map->vma = NULL;