Enforce the access flags that were added earlier.
Signed-off-by: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
---
drivers/dma-buf/udmabuf.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 4ecf2a94fed3..134e53d24c2b 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -16,6 +16,7 @@ static const u32 list_limit = 1024; /* udmabuf_create_list->count limit */
static const size_t size_limit_mb = 64; /* total dmabuf size, in megabytes */
struct udmabuf {
+ u32 flags;
pgoff_t pagecount;
struct page **pages;
};
@@ -37,10 +38,17 @@ static const struct vm_operations_struct udmabuf_vm_ops = {
static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
{
struct udmabuf *ubuf = buf->priv;
+ pgprot_t pgprot = vm_get_page_prot(vma->vm_flags);
if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0)
return -EINVAL;
+ if (ubuf->flags & UDMABUF_FLAGS_PROT_NONE)
+ return -EINVAL;
+
+ if ((ubuf->flags & UDMABUF_FLAGS_PROT_READ) == 0)
+ vma->vm_page_prot = pgprot_writecombine(pgprot);
+
vma->vm_ops = &udmabuf_vm_ops;
vma->vm_private_data = ubuf;
return 0;
@@ -193,6 +201,7 @@ static long udmabuf_create(const struct udmabuf_create_list *head,
else if (head->flags & UDMABUF_FLAGS_PROT_WRITE)
exp_info.flags = O_WRONLY;
+ ubuf->flags = head->flags;
buf = dma_buf_export(&exp_info);
if (IS_ERR(buf)) {
ret = PTR_ERR(buf);
--
2.17.1
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