[PATCH v1 1/6] dma-buf: Move dma_buf_mmap_internal() to dynamic locking specification

[Dmitry Osipenko]

All dma-buf functions has been moved to dynamic locking specification
The dma_buf_mmap_internal() was missed out by accident. Take reservation
lock around file mapping operation to adhere the common locking convention.

Reported-by: Daniel Vetter <dan...@ffwll.ch>
Signed-off-by: Dmitry Osipenko <dmitry.osipe...@collabora.com>
---
 drivers/dma-buf/dma-buf.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 13bfd2d09c56..b809513b03fe 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -129,6 +129,7 @@ static struct file_system_type dma_buf_fs_type = {
 static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma)
 {
        struct dma_buf *dmabuf;
+       int ret;
 
        if (!is_dma_buf_file(file))
                return -EINVAL;
@@ -144,7 +145,11 @@ static int dma_buf_mmap_internal(struct file *file, struct 
vm_area_struct *vma)
            dmabuf->size >> PAGE_SHIFT)
                return -EINVAL;
 
-       return dmabuf->ops->mmap(dmabuf, vma);
+       dma_resv_lock(dmabuf->resv, NULL);
+       ret = dmabuf->ops->mmap(dmabuf, vma);
+       dma_resv_unlock(dmabuf->resv);
+
+       return ret;
 }
 
 static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence)
-- 
2.37.3