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path: root/drivers/xen/privcmd-buf.c
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Diffstat (limited to 'drivers/xen/privcmd-buf.c')
-rw-r--r--drivers/xen/privcmd-buf.c22
1 files changed, 4 insertions, 18 deletions
diff --git a/drivers/xen/privcmd-buf.c b/drivers/xen/privcmd-buf.c
index df1ed37c3269..de01a6d0059d 100644
--- a/drivers/xen/privcmd-buf.c
+++ b/drivers/xen/privcmd-buf.c
@@ -21,15 +21,9 @@
MODULE_LICENSE("GPL");
-static unsigned int limit = 64;
-module_param(limit, uint, 0644);
-MODULE_PARM_DESC(limit, "Maximum number of pages that may be allocated by "
- "the privcmd-buf device per open file");
-
struct privcmd_buf_private {
struct mutex lock;
struct list_head list;
- unsigned int allocated;
};
struct privcmd_buf_vma_private {
@@ -60,13 +54,10 @@ static void privcmd_buf_vmapriv_free(struct privcmd_buf_vma_private *vma_priv)
{
unsigned int i;
- vma_priv->file_priv->allocated -= vma_priv->n_pages;
-
list_del(&vma_priv->list);
for (i = 0; i < vma_priv->n_pages; i++)
- if (vma_priv->pages[i])
- __free_page(vma_priv->pages[i]);
+ __free_page(vma_priv->pages[i]);
kfree(vma_priv);
}
@@ -146,8 +137,7 @@ static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma)
unsigned int i;
int ret = 0;
- if (!(vma->vm_flags & VM_SHARED) || count > limit ||
- file_priv->allocated + count > limit)
+ if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
vma_priv = kzalloc(sizeof(*vma_priv) + count * sizeof(void *),
@@ -155,19 +145,15 @@ static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma)
if (!vma_priv)
return -ENOMEM;
- vma_priv->n_pages = count;
- count = 0;
- for (i = 0; i < vma_priv->n_pages; i++) {
+ for (i = 0; i < count; i++) {
vma_priv->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!vma_priv->pages[i])
break;
- count++;
+ vma_priv->n_pages++;
}
mutex_lock(&file_priv->lock);
- file_priv->allocated += count;
-
vma_priv->file_priv = file_priv;
vma_priv->users = 1;